Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/fs/ncpfs/dir.c
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
File MIME type: text/plain
File size: 31829 byte(s)
Tag kernel26-2.6.12-alx-r9
1 | /* |
2 | * dir.c |
3 | * |
4 | * Copyright (C) 1995, 1996 by Volker Lendecke |
5 | * Modified for big endian by J.F. Chadima and David S. Miller |
6 | * Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache |
7 | * Modified 1998, 1999 Wolfram Pienkoss for NLS |
8 | * Modified 1999 Wolfram Pienkoss for directory caching |
9 | * Modified 2000 Ben Harris, University of Cambridge for NFS NS meta-info |
10 | * |
11 | */ |
12 | |
13 | #include <linux/config.h> |
14 | |
15 | #include <linux/time.h> |
16 | #include <linux/errno.h> |
17 | #include <linux/stat.h> |
18 | #include <linux/kernel.h> |
19 | #include <linux/slab.h> |
20 | #include <linux/vmalloc.h> |
21 | #include <linux/mm.h> |
22 | #include <asm/uaccess.h> |
23 | #include <asm/byteorder.h> |
24 | #include <linux/smp_lock.h> |
25 | |
26 | #include <linux/ncp_fs.h> |
27 | |
28 | #include "ncplib_kernel.h" |
29 | |
30 | static void ncp_read_volume_list(struct file *, void *, filldir_t, |
31 | struct ncp_cache_control *); |
32 | static void ncp_do_readdir(struct file *, void *, filldir_t, |
33 | struct ncp_cache_control *); |
34 | |
35 | static int ncp_readdir(struct file *, void *, filldir_t); |
36 | |
37 | static int ncp_create(struct inode *, struct dentry *, int, struct nameidata *); |
38 | static struct dentry *ncp_lookup(struct inode *, struct dentry *, struct nameidata *); |
39 | static int ncp_unlink(struct inode *, struct dentry *); |
40 | static int ncp_mkdir(struct inode *, struct dentry *, int); |
41 | static int ncp_rmdir(struct inode *, struct dentry *); |
42 | static int ncp_rename(struct inode *, struct dentry *, |
43 | struct inode *, struct dentry *); |
44 | static int ncp_mknod(struct inode * dir, struct dentry *dentry, |
45 | int mode, dev_t rdev); |
46 | #if defined(CONFIG_NCPFS_EXTRAS) || defined(CONFIG_NCPFS_NFS_NS) |
47 | extern int ncp_symlink(struct inode *, struct dentry *, const char *); |
48 | #else |
49 | #define ncp_symlink NULL |
50 | #endif |
51 | |
52 | struct file_operations ncp_dir_operations = |
53 | { |
54 | .read = generic_read_dir, |
55 | .readdir = ncp_readdir, |
56 | .ioctl = ncp_ioctl, |
57 | }; |
58 | |
59 | struct inode_operations ncp_dir_inode_operations = |
60 | { |
61 | .create = ncp_create, |
62 | .lookup = ncp_lookup, |
63 | .unlink = ncp_unlink, |
64 | .symlink = ncp_symlink, |
65 | .mkdir = ncp_mkdir, |
66 | .rmdir = ncp_rmdir, |
67 | .mknod = ncp_mknod, |
68 | .rename = ncp_rename, |
69 | .setattr = ncp_notify_change, |
70 | }; |
71 | |
72 | /* |
73 | * Dentry operations routines |
74 | */ |
75 | static int ncp_lookup_validate(struct dentry *, struct nameidata *); |
76 | static int ncp_hash_dentry(struct dentry *, struct qstr *); |
77 | static int ncp_compare_dentry (struct dentry *, struct qstr *, struct qstr *); |
78 | static int ncp_delete_dentry(struct dentry *); |
79 | |
80 | static struct dentry_operations ncp_dentry_operations = |
81 | { |
82 | .d_revalidate = ncp_lookup_validate, |
83 | .d_hash = ncp_hash_dentry, |
84 | .d_compare = ncp_compare_dentry, |
85 | .d_delete = ncp_delete_dentry, |
86 | }; |
87 | |
88 | struct dentry_operations ncp_root_dentry_operations = |
89 | { |
90 | .d_hash = ncp_hash_dentry, |
91 | .d_compare = ncp_compare_dentry, |
92 | .d_delete = ncp_delete_dentry, |
93 | }; |
94 | |
95 | |
96 | /* |
97 | * Note: leave the hash unchanged if the directory |
98 | * is case-sensitive. |
99 | */ |
100 | static int |
101 | ncp_hash_dentry(struct dentry *dentry, struct qstr *this) |
102 | { |
103 | struct nls_table *t; |
104 | unsigned long hash; |
105 | int i; |
106 | |
107 | t = NCP_IO_TABLE(dentry); |
108 | |
109 | if (!ncp_case_sensitive(dentry->d_inode)) { |
110 | hash = init_name_hash(); |
111 | for (i=0; i<this->len ; i++) |
112 | hash = partial_name_hash(ncp_tolower(t, this->name[i]), |
113 | hash); |
114 | this->hash = end_name_hash(hash); |
115 | } |
116 | return 0; |
117 | } |
118 | |
119 | static int |
120 | ncp_compare_dentry(struct dentry *dentry, struct qstr *a, struct qstr *b) |
121 | { |
122 | if (a->len != b->len) |
123 | return 1; |
124 | |
125 | if (ncp_case_sensitive(dentry->d_inode)) |
126 | return strncmp(a->name, b->name, a->len); |
127 | |
128 | return ncp_strnicmp(NCP_IO_TABLE(dentry), a->name, b->name, a->len); |
129 | } |
130 | |
131 | /* |
132 | * This is the callback from dput() when d_count is going to 0. |
133 | * We use this to unhash dentries with bad inodes. |
134 | * Closing files can be safely postponed until iput() - it's done there anyway. |
135 | */ |
136 | static int |
137 | ncp_delete_dentry(struct dentry * dentry) |
138 | { |
139 | struct inode *inode = dentry->d_inode; |
140 | |
141 | if (inode) { |
142 | if (is_bad_inode(inode)) |
143 | return 1; |
144 | } else |
145 | { |
146 | /* N.B. Unhash negative dentries? */ |
147 | } |
148 | return 0; |
149 | } |
150 | |
151 | static inline int |
152 | ncp_single_volume(struct ncp_server *server) |
153 | { |
154 | return (server->m.mounted_vol[0] != '\0'); |
155 | } |
156 | |
157 | static inline int ncp_is_server_root(struct inode *inode) |
158 | { |
159 | return (!ncp_single_volume(NCP_SERVER(inode)) && |
160 | inode == inode->i_sb->s_root->d_inode); |
161 | } |
162 | |
163 | |
164 | /* |
165 | * This is the callback when the dcache has a lookup hit. |
166 | */ |
167 | |
168 | |
169 | #ifdef CONFIG_NCPFS_STRONG |
170 | /* try to delete a readonly file (NW R bit set) */ |
171 | |
172 | static int |
173 | ncp_force_unlink(struct inode *dir, struct dentry* dentry) |
174 | { |
175 | int res=0x9c,res2; |
176 | struct nw_modify_dos_info info; |
177 | __le32 old_nwattr; |
178 | struct inode *inode; |
179 | |
180 | memset(&info, 0, sizeof(info)); |
181 | |
182 | /* remove the Read-Only flag on the NW server */ |
183 | inode = dentry->d_inode; |
184 | |
185 | old_nwattr = NCP_FINFO(inode)->nwattr; |
186 | info.attributes = old_nwattr & ~(aRONLY|aDELETEINHIBIT|aRENAMEINHIBIT); |
187 | res2 = ncp_modify_file_or_subdir_dos_info_path(NCP_SERVER(inode), inode, NULL, DM_ATTRIBUTES, &info); |
188 | if (res2) |
189 | goto leave_me; |
190 | |
191 | /* now try again the delete operation */ |
192 | res = ncp_del_file_or_subdir2(NCP_SERVER(dir), dentry); |
193 | |
194 | if (res) /* delete failed, set R bit again */ |
195 | { |
196 | info.attributes = old_nwattr; |
197 | res2 = ncp_modify_file_or_subdir_dos_info_path(NCP_SERVER(inode), inode, NULL, DM_ATTRIBUTES, &info); |
198 | if (res2) |
199 | goto leave_me; |
200 | } |
201 | leave_me: |
202 | return(res); |
203 | } |
204 | #endif /* CONFIG_NCPFS_STRONG */ |
205 | |
206 | #ifdef CONFIG_NCPFS_STRONG |
207 | static int |
208 | ncp_force_rename(struct inode *old_dir, struct dentry* old_dentry, char *_old_name, |
209 | struct inode *new_dir, struct dentry* new_dentry, char *_new_name) |
210 | { |
211 | struct nw_modify_dos_info info; |
212 | int res=0x90,res2; |
213 | struct inode *old_inode = old_dentry->d_inode; |
214 | __le32 old_nwattr = NCP_FINFO(old_inode)->nwattr; |
215 | __le32 new_nwattr = 0; /* shut compiler warning */ |
216 | int old_nwattr_changed = 0; |
217 | int new_nwattr_changed = 0; |
218 | |
219 | memset(&info, 0, sizeof(info)); |
220 | |
221 | /* remove the Read-Only flag on the NW server */ |
222 | |
223 | info.attributes = old_nwattr & ~(aRONLY|aRENAMEINHIBIT|aDELETEINHIBIT); |
224 | res2 = ncp_modify_file_or_subdir_dos_info_path(NCP_SERVER(old_inode), old_inode, NULL, DM_ATTRIBUTES, &info); |
225 | if (!res2) |
226 | old_nwattr_changed = 1; |
227 | if (new_dentry && new_dentry->d_inode) { |
228 | new_nwattr = NCP_FINFO(new_dentry->d_inode)->nwattr; |
229 | info.attributes = new_nwattr & ~(aRONLY|aRENAMEINHIBIT|aDELETEINHIBIT); |
230 | res2 = ncp_modify_file_or_subdir_dos_info_path(NCP_SERVER(new_dir), new_dir, _new_name, DM_ATTRIBUTES, &info); |
231 | if (!res2) |
232 | new_nwattr_changed = 1; |
233 | } |
234 | /* now try again the rename operation */ |
235 | /* but only if something really happened */ |
236 | if (new_nwattr_changed || old_nwattr_changed) { |
237 | res = ncp_ren_or_mov_file_or_subdir(NCP_SERVER(old_dir), |
238 | old_dir, _old_name, |
239 | new_dir, _new_name); |
240 | } |
241 | if (res) |
242 | goto leave_me; |
243 | /* file was successfully renamed, so: |
244 | do not set attributes on old file - it no longer exists |
245 | copy attributes from old file to new */ |
246 | new_nwattr_changed = old_nwattr_changed; |
247 | new_nwattr = old_nwattr; |
248 | old_nwattr_changed = 0; |
249 | |
250 | leave_me:; |
251 | if (old_nwattr_changed) { |
252 | info.attributes = old_nwattr; |
253 | res2 = ncp_modify_file_or_subdir_dos_info_path(NCP_SERVER(old_inode), old_inode, NULL, DM_ATTRIBUTES, &info); |
254 | /* ignore errors */ |
255 | } |
256 | if (new_nwattr_changed) { |
257 | info.attributes = new_nwattr; |
258 | res2 = ncp_modify_file_or_subdir_dos_info_path(NCP_SERVER(new_dir), new_dir, _new_name, DM_ATTRIBUTES, &info); |
259 | /* ignore errors */ |
260 | } |
261 | return(res); |
262 | } |
263 | #endif /* CONFIG_NCPFS_STRONG */ |
264 | |
265 | |
266 | static int |
267 | __ncp_lookup_validate(struct dentry * dentry, struct nameidata *nd) |
268 | { |
269 | struct ncp_server *server; |
270 | struct dentry *parent; |
271 | struct inode *dir; |
272 | struct ncp_entry_info finfo; |
273 | int res, val = 0, len; |
274 | __u8 __name[NCP_MAXPATHLEN + 1]; |
275 | |
276 | parent = dget_parent(dentry); |
277 | dir = parent->d_inode; |
278 | |
279 | if (!dentry->d_inode) |
280 | goto finished; |
281 | |
282 | server = NCP_SERVER(dir); |
283 | |
284 | if (!ncp_conn_valid(server)) |
285 | goto finished; |
286 | |
287 | /* |
288 | * Inspired by smbfs: |
289 | * The default validation is based on dentry age: |
290 | * We set the max age at mount time. (But each |
291 | * successful server lookup renews the timestamp.) |
292 | */ |
293 | val = NCP_TEST_AGE(server, dentry); |
294 | if (val) |
295 | goto finished; |
296 | |
297 | DDPRINTK("ncp_lookup_validate: %s/%s not valid, age=%ld, server lookup\n", |
298 | dentry->d_parent->d_name.name, dentry->d_name.name, |
299 | NCP_GET_AGE(dentry)); |
300 | |
301 | len = sizeof(__name); |
302 | if (ncp_is_server_root(dir)) { |
303 | res = ncp_io2vol(server, __name, &len, dentry->d_name.name, |
304 | dentry->d_name.len, 1); |
305 | if (!res) |
306 | res = ncp_lookup_volume(server, __name, &(finfo.i)); |
307 | } else { |
308 | res = ncp_io2vol(server, __name, &len, dentry->d_name.name, |
309 | dentry->d_name.len, !ncp_preserve_case(dir)); |
310 | if (!res) |
311 | res = ncp_obtain_info(server, dir, __name, &(finfo.i)); |
312 | } |
313 | finfo.volume = finfo.i.volNumber; |
314 | DDPRINTK("ncp_lookup_validate: looked for %s/%s, res=%d\n", |
315 | dentry->d_parent->d_name.name, __name, res); |
316 | /* |
317 | * If we didn't find it, or if it has a different dirEntNum to |
318 | * what we remember, it's not valid any more. |
319 | */ |
320 | if (!res) { |
321 | if (finfo.i.dirEntNum == NCP_FINFO(dentry->d_inode)->dirEntNum) { |
322 | ncp_new_dentry(dentry); |
323 | val=1; |
324 | } else |
325 | DDPRINTK("ncp_lookup_validate: found, but dirEntNum changed\n"); |
326 | |
327 | ncp_update_inode2(dentry->d_inode, &finfo); |
328 | } |
329 | |
330 | finished: |
331 | DDPRINTK("ncp_lookup_validate: result=%d\n", val); |
332 | dput(parent); |
333 | return val; |
334 | } |
335 | |
336 | static int |
337 | ncp_lookup_validate(struct dentry * dentry, struct nameidata *nd) |
338 | { |
339 | int res; |
340 | lock_kernel(); |
341 | res = __ncp_lookup_validate(dentry, nd); |
342 | unlock_kernel(); |
343 | return res; |
344 | } |
345 | |
346 | static struct dentry * |
347 | ncp_dget_fpos(struct dentry *dentry, struct dentry *parent, unsigned long fpos) |
348 | { |
349 | struct dentry *dent = dentry; |
350 | struct list_head *next; |
351 | |
352 | if (d_validate(dent, parent)) { |
353 | if (dent->d_name.len <= NCP_MAXPATHLEN && |
354 | (unsigned long)dent->d_fsdata == fpos) { |
355 | if (!dent->d_inode) { |
356 | dput(dent); |
357 | dent = NULL; |
358 | } |
359 | return dent; |
360 | } |
361 | dput(dent); |
362 | } |
363 | |
364 | /* If a pointer is invalid, we search the dentry. */ |
365 | spin_lock(&dcache_lock); |
366 | next = parent->d_subdirs.next; |
367 | while (next != &parent->d_subdirs) { |
368 | dent = list_entry(next, struct dentry, d_child); |
369 | if ((unsigned long)dent->d_fsdata == fpos) { |
370 | if (dent->d_inode) |
371 | dget_locked(dent); |
372 | else |
373 | dent = NULL; |
374 | spin_unlock(&dcache_lock); |
375 | goto out; |
376 | } |
377 | next = next->next; |
378 | } |
379 | spin_unlock(&dcache_lock); |
380 | return NULL; |
381 | |
382 | out: |
383 | return dent; |
384 | } |
385 | |
386 | static time_t ncp_obtain_mtime(struct dentry *dentry) |
387 | { |
388 | struct inode *inode = dentry->d_inode; |
389 | struct ncp_server *server = NCP_SERVER(inode); |
390 | struct nw_info_struct i; |
391 | |
392 | if (!ncp_conn_valid(server) || ncp_is_server_root(inode)) |
393 | return 0; |
394 | |
395 | if (ncp_obtain_info(server, inode, NULL, &i)) |
396 | return 0; |
397 | |
398 | return ncp_date_dos2unix(i.modifyTime, i.modifyDate); |
399 | } |
400 | |
401 | static int ncp_readdir(struct file *filp, void *dirent, filldir_t filldir) |
402 | { |
403 | struct dentry *dentry = filp->f_dentry; |
404 | struct inode *inode = dentry->d_inode; |
405 | struct page *page = NULL; |
406 | struct ncp_server *server = NCP_SERVER(inode); |
407 | union ncp_dir_cache *cache = NULL; |
408 | struct ncp_cache_control ctl; |
409 | int result, mtime_valid = 0; |
410 | time_t mtime = 0; |
411 | |
412 | lock_kernel(); |
413 | |
414 | ctl.page = NULL; |
415 | ctl.cache = NULL; |
416 | |
417 | DDPRINTK("ncp_readdir: reading %s/%s, pos=%d\n", |
418 | dentry->d_parent->d_name.name, dentry->d_name.name, |
419 | (int) filp->f_pos); |
420 | |
421 | result = -EIO; |
422 | if (!ncp_conn_valid(server)) |
423 | goto out; |
424 | |
425 | result = 0; |
426 | if (filp->f_pos == 0) { |
427 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR)) |
428 | goto out; |
429 | filp->f_pos = 1; |
430 | } |
431 | if (filp->f_pos == 1) { |
432 | if (filldir(dirent, "..", 2, 1, parent_ino(dentry), DT_DIR)) |
433 | goto out; |
434 | filp->f_pos = 2; |
435 | } |
436 | |
437 | page = grab_cache_page(&inode->i_data, 0); |
438 | if (!page) |
439 | goto read_really; |
440 | |
441 | ctl.cache = cache = kmap(page); |
442 | ctl.head = cache->head; |
443 | |
444 | if (!PageUptodate(page) || !ctl.head.eof) |
445 | goto init_cache; |
446 | |
447 | if (filp->f_pos == 2) { |
448 | if (jiffies - ctl.head.time >= NCP_MAX_AGE(server)) |
449 | goto init_cache; |
450 | |
451 | mtime = ncp_obtain_mtime(dentry); |
452 | mtime_valid = 1; |
453 | if ((!mtime) || (mtime != ctl.head.mtime)) |
454 | goto init_cache; |
455 | } |
456 | |
457 | if (filp->f_pos > ctl.head.end) |
458 | goto finished; |
459 | |
460 | ctl.fpos = filp->f_pos + (NCP_DIRCACHE_START - 2); |
461 | ctl.ofs = ctl.fpos / NCP_DIRCACHE_SIZE; |
462 | ctl.idx = ctl.fpos % NCP_DIRCACHE_SIZE; |
463 | |
464 | for (;;) { |
465 | if (ctl.ofs != 0) { |
466 | ctl.page = find_lock_page(&inode->i_data, ctl.ofs); |
467 | if (!ctl.page) |
468 | goto invalid_cache; |
469 | ctl.cache = kmap(ctl.page); |
470 | if (!PageUptodate(ctl.page)) |
471 | goto invalid_cache; |
472 | } |
473 | while (ctl.idx < NCP_DIRCACHE_SIZE) { |
474 | struct dentry *dent; |
475 | int res; |
476 | |
477 | dent = ncp_dget_fpos(ctl.cache->dentry[ctl.idx], |
478 | dentry, filp->f_pos); |
479 | if (!dent) |
480 | goto invalid_cache; |
481 | res = filldir(dirent, dent->d_name.name, |
482 | dent->d_name.len, filp->f_pos, |
483 | dent->d_inode->i_ino, DT_UNKNOWN); |
484 | dput(dent); |
485 | if (res) |
486 | goto finished; |
487 | filp->f_pos += 1; |
488 | ctl.idx += 1; |
489 | if (filp->f_pos > ctl.head.end) |
490 | goto finished; |
491 | } |
492 | if (ctl.page) { |
493 | kunmap(ctl.page); |
494 | SetPageUptodate(ctl.page); |
495 | unlock_page(ctl.page); |
496 | page_cache_release(ctl.page); |
497 | ctl.page = NULL; |
498 | } |
499 | ctl.idx = 0; |
500 | ctl.ofs += 1; |
501 | } |
502 | invalid_cache: |
503 | if (ctl.page) { |
504 | kunmap(ctl.page); |
505 | unlock_page(ctl.page); |
506 | page_cache_release(ctl.page); |
507 | ctl.page = NULL; |
508 | } |
509 | ctl.cache = cache; |
510 | init_cache: |
511 | ncp_invalidate_dircache_entries(dentry); |
512 | if (!mtime_valid) { |
513 | mtime = ncp_obtain_mtime(dentry); |
514 | mtime_valid = 1; |
515 | } |
516 | ctl.head.mtime = mtime; |
517 | ctl.head.time = jiffies; |
518 | ctl.head.eof = 0; |
519 | ctl.fpos = 2; |
520 | ctl.ofs = 0; |
521 | ctl.idx = NCP_DIRCACHE_START; |
522 | ctl.filled = 0; |
523 | ctl.valid = 1; |
524 | read_really: |
525 | if (ncp_is_server_root(inode)) { |
526 | ncp_read_volume_list(filp, dirent, filldir, &ctl); |
527 | } else { |
528 | ncp_do_readdir(filp, dirent, filldir, &ctl); |
529 | } |
530 | ctl.head.end = ctl.fpos - 1; |
531 | ctl.head.eof = ctl.valid; |
532 | finished: |
533 | if (page) { |
534 | cache->head = ctl.head; |
535 | kunmap(page); |
536 | SetPageUptodate(page); |
537 | unlock_page(page); |
538 | page_cache_release(page); |
539 | } |
540 | if (ctl.page) { |
541 | kunmap(ctl.page); |
542 | SetPageUptodate(ctl.page); |
543 | unlock_page(ctl.page); |
544 | page_cache_release(ctl.page); |
545 | } |
546 | out: |
547 | unlock_kernel(); |
548 | return result; |
549 | } |
550 | |
551 | static int |
552 | ncp_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
553 | struct ncp_cache_control *ctrl, struct ncp_entry_info *entry) |
554 | { |
555 | struct dentry *newdent, *dentry = filp->f_dentry; |
556 | struct inode *newino, *inode = dentry->d_inode; |
557 | struct ncp_cache_control ctl = *ctrl; |
558 | struct qstr qname; |
559 | int valid = 0; |
560 | int hashed = 0; |
561 | ino_t ino = 0; |
562 | __u8 __name[NCP_MAXPATHLEN + 1]; |
563 | |
564 | qname.len = sizeof(__name); |
565 | if (ncp_vol2io(NCP_SERVER(inode), __name, &qname.len, |
566 | entry->i.entryName, entry->i.nameLen, |
567 | !ncp_preserve_entry_case(inode, entry->i.NSCreator))) |
568 | return 1; /* I'm not sure */ |
569 | |
570 | qname.name = __name; |
571 | qname.hash = full_name_hash(qname.name, qname.len); |
572 | |
573 | if (dentry->d_op && dentry->d_op->d_hash) |
574 | if (dentry->d_op->d_hash(dentry, &qname) != 0) |
575 | goto end_advance; |
576 | |
577 | newdent = d_lookup(dentry, &qname); |
578 | |
579 | if (!newdent) { |
580 | newdent = d_alloc(dentry, &qname); |
581 | if (!newdent) |
582 | goto end_advance; |
583 | } else { |
584 | hashed = 1; |
585 | memcpy((char *) newdent->d_name.name, qname.name, |
586 | newdent->d_name.len); |
587 | } |
588 | |
589 | if (!newdent->d_inode) { |
590 | entry->opened = 0; |
591 | entry->ino = iunique(inode->i_sb, 2); |
592 | newino = ncp_iget(inode->i_sb, entry); |
593 | if (newino) { |
594 | newdent->d_op = &ncp_dentry_operations; |
595 | d_instantiate(newdent, newino); |
596 | if (!hashed) |
597 | d_rehash(newdent); |
598 | } |
599 | } else |
600 | ncp_update_inode2(newdent->d_inode, entry); |
601 | |
602 | if (newdent->d_inode) { |
603 | ino = newdent->d_inode->i_ino; |
604 | newdent->d_fsdata = (void *) ctl.fpos; |
605 | ncp_new_dentry(newdent); |
606 | } |
607 | |
608 | if (ctl.idx >= NCP_DIRCACHE_SIZE) { |
609 | if (ctl.page) { |
610 | kunmap(ctl.page); |
611 | SetPageUptodate(ctl.page); |
612 | unlock_page(ctl.page); |
613 | page_cache_release(ctl.page); |
614 | } |
615 | ctl.cache = NULL; |
616 | ctl.idx -= NCP_DIRCACHE_SIZE; |
617 | ctl.ofs += 1; |
618 | ctl.page = grab_cache_page(&inode->i_data, ctl.ofs); |
619 | if (ctl.page) |
620 | ctl.cache = kmap(ctl.page); |
621 | } |
622 | if (ctl.cache) { |
623 | ctl.cache->dentry[ctl.idx] = newdent; |
624 | valid = 1; |
625 | } |
626 | dput(newdent); |
627 | end_advance: |
628 | if (!valid) |
629 | ctl.valid = 0; |
630 | if (!ctl.filled && (ctl.fpos == filp->f_pos)) { |
631 | if (!ino) |
632 | ino = find_inode_number(dentry, &qname); |
633 | if (!ino) |
634 | ino = iunique(inode->i_sb, 2); |
635 | ctl.filled = filldir(dirent, qname.name, qname.len, |
636 | filp->f_pos, ino, DT_UNKNOWN); |
637 | if (!ctl.filled) |
638 | filp->f_pos += 1; |
639 | } |
640 | ctl.fpos += 1; |
641 | ctl.idx += 1; |
642 | *ctrl = ctl; |
643 | return (ctl.valid || !ctl.filled); |
644 | } |
645 | |
646 | static void |
647 | ncp_read_volume_list(struct file *filp, void *dirent, filldir_t filldir, |
648 | struct ncp_cache_control *ctl) |
649 | { |
650 | struct dentry *dentry = filp->f_dentry; |
651 | struct inode *inode = dentry->d_inode; |
652 | struct ncp_server *server = NCP_SERVER(inode); |
653 | struct ncp_volume_info info; |
654 | struct ncp_entry_info entry; |
655 | int i; |
656 | |
657 | DPRINTK("ncp_read_volume_list: pos=%ld\n", |
658 | (unsigned long) filp->f_pos); |
659 | |
660 | for (i = 0; i < NCP_NUMBER_OF_VOLUMES; i++) { |
661 | |
662 | if (ncp_get_volume_info_with_number(server, i, &info) != 0) |
663 | return; |
664 | if (!strlen(info.volume_name)) |
665 | continue; |
666 | |
667 | DPRINTK("ncp_read_volume_list: found vol: %s\n", |
668 | info.volume_name); |
669 | |
670 | if (ncp_lookup_volume(server, info.volume_name, |
671 | &entry.i)) { |
672 | DPRINTK("ncpfs: could not lookup vol %s\n", |
673 | info.volume_name); |
674 | continue; |
675 | } |
676 | entry.volume = entry.i.volNumber; |
677 | if (!ncp_fill_cache(filp, dirent, filldir, ctl, &entry)) |
678 | return; |
679 | } |
680 | } |
681 | |
682 | static void |
683 | ncp_do_readdir(struct file *filp, void *dirent, filldir_t filldir, |
684 | struct ncp_cache_control *ctl) |
685 | { |
686 | struct dentry *dentry = filp->f_dentry; |
687 | struct inode *dir = dentry->d_inode; |
688 | struct ncp_server *server = NCP_SERVER(dir); |
689 | struct nw_search_sequence seq; |
690 | struct ncp_entry_info entry; |
691 | int err; |
692 | void* buf; |
693 | int more; |
694 | size_t bufsize; |
695 | |
696 | DPRINTK("ncp_do_readdir: %s/%s, fpos=%ld\n", |
697 | dentry->d_parent->d_name.name, dentry->d_name.name, |
698 | (unsigned long) filp->f_pos); |
699 | PPRINTK("ncp_do_readdir: init %s, volnum=%d, dirent=%u\n", |
700 | dentry->d_name.name, NCP_FINFO(dir)->volNumber, |
701 | NCP_FINFO(dir)->dirEntNum); |
702 | |
703 | err = ncp_initialize_search(server, dir, &seq); |
704 | if (err) { |
705 | DPRINTK("ncp_do_readdir: init failed, err=%d\n", err); |
706 | return; |
707 | } |
708 | #ifdef USE_OLD_SLOW_DIRECTORY_LISTING |
709 | for (;;) { |
710 | err = ncp_search_for_file_or_subdir(server, &seq, &entry.i); |
711 | if (err) { |
712 | DPRINTK("ncp_do_readdir: search failed, err=%d\n", err); |
713 | break; |
714 | } |
715 | entry.volume = entry.i.volNumber; |
716 | if (!ncp_fill_cache(filp, dirent, filldir, ctl, &entry)) |
717 | break; |
718 | } |
719 | #else |
720 | /* We MUST NOT use server->buffer_size handshaked with server if we are |
721 | using UDP, as for UDP server uses max. buffer size determined by |
722 | MTU, and for TCP server uses hardwired value 65KB (== 66560 bytes). |
723 | So we use 128KB, just to be sure, as there is no way how to know |
724 | this value in advance. */ |
725 | bufsize = 131072; |
726 | buf = vmalloc(bufsize); |
727 | if (!buf) |
728 | return; |
729 | do { |
730 | int cnt; |
731 | char* rpl; |
732 | size_t rpls; |
733 | |
734 | err = ncp_search_for_fileset(server, &seq, &more, &cnt, buf, bufsize, &rpl, &rpls); |
735 | if (err) /* Error */ |
736 | break; |
737 | if (!cnt) /* prevent endless loop */ |
738 | break; |
739 | while (cnt--) { |
740 | size_t onerpl; |
741 | |
742 | if (rpls < offsetof(struct nw_info_struct, entryName)) |
743 | break; /* short packet */ |
744 | ncp_extract_file_info(rpl, &entry.i); |
745 | onerpl = offsetof(struct nw_info_struct, entryName) + entry.i.nameLen; |
746 | if (rpls < onerpl) |
747 | break; /* short packet */ |
748 | (void)ncp_obtain_nfs_info(server, &entry.i); |
749 | rpl += onerpl; |
750 | rpls -= onerpl; |
751 | entry.volume = entry.i.volNumber; |
752 | if (!ncp_fill_cache(filp, dirent, filldir, ctl, &entry)) |
753 | break; |
754 | } |
755 | } while (more); |
756 | vfree(buf); |
757 | #endif |
758 | return; |
759 | } |
760 | |
761 | int ncp_conn_logged_in(struct super_block *sb) |
762 | { |
763 | struct ncp_server* server = NCP_SBP(sb); |
764 | int result; |
765 | |
766 | if (ncp_single_volume(server)) { |
767 | int len; |
768 | struct dentry* dent; |
769 | __u32 volNumber; |
770 | __le32 dirEntNum; |
771 | __le32 DosDirNum; |
772 | __u8 __name[NCP_MAXPATHLEN + 1]; |
773 | |
774 | len = sizeof(__name); |
775 | result = ncp_io2vol(server, __name, &len, server->m.mounted_vol, |
776 | strlen(server->m.mounted_vol), 1); |
777 | if (result) |
778 | goto out; |
779 | result = -ENOENT; |
780 | if (ncp_get_volume_root(server, __name, &volNumber, &dirEntNum, &DosDirNum)) { |
781 | PPRINTK("ncp_conn_logged_in: %s not found\n", |
782 | server->m.mounted_vol); |
783 | goto out; |
784 | } |
785 | dent = sb->s_root; |
786 | if (dent) { |
787 | struct inode* ino = dent->d_inode; |
788 | if (ino) { |
789 | NCP_FINFO(ino)->volNumber = volNumber; |
790 | NCP_FINFO(ino)->dirEntNum = dirEntNum; |
791 | NCP_FINFO(ino)->DosDirNum = DosDirNum; |
792 | } else { |
793 | DPRINTK("ncpfs: sb->s_root->d_inode == NULL!\n"); |
794 | } |
795 | } else { |
796 | DPRINTK("ncpfs: sb->s_root == NULL!\n"); |
797 | } |
798 | } |
799 | result = 0; |
800 | |
801 | out: |
802 | return result; |
803 | } |
804 | |
805 | static struct dentry *ncp_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) |
806 | { |
807 | struct ncp_server *server = NCP_SERVER(dir); |
808 | struct inode *inode = NULL; |
809 | struct ncp_entry_info finfo; |
810 | int error, res, len; |
811 | __u8 __name[NCP_MAXPATHLEN + 1]; |
812 | |
813 | lock_kernel(); |
814 | error = -EIO; |
815 | if (!ncp_conn_valid(server)) |
816 | goto finished; |
817 | |
818 | PPRINTK("ncp_lookup: server lookup for %s/%s\n", |
819 | dentry->d_parent->d_name.name, dentry->d_name.name); |
820 | |
821 | len = sizeof(__name); |
822 | if (ncp_is_server_root(dir)) { |
823 | res = ncp_io2vol(server, __name, &len, dentry->d_name.name, |
824 | dentry->d_name.len, 1); |
825 | if (!res) |
826 | res = ncp_lookup_volume(server, __name, &(finfo.i)); |
827 | } else { |
828 | res = ncp_io2vol(server, __name, &len, dentry->d_name.name, |
829 | dentry->d_name.len, !ncp_preserve_case(dir)); |
830 | if (!res) |
831 | res = ncp_obtain_info(server, dir, __name, &(finfo.i)); |
832 | } |
833 | PPRINTK("ncp_lookup: looked for %s/%s, res=%d\n", |
834 | dentry->d_parent->d_name.name, __name, res); |
835 | /* |
836 | * If we didn't find an entry, make a negative dentry. |
837 | */ |
838 | if (res) |
839 | goto add_entry; |
840 | |
841 | /* |
842 | * Create an inode for the entry. |
843 | */ |
844 | finfo.opened = 0; |
845 | finfo.ino = iunique(dir->i_sb, 2); |
846 | finfo.volume = finfo.i.volNumber; |
847 | error = -EACCES; |
848 | inode = ncp_iget(dir->i_sb, &finfo); |
849 | |
850 | if (inode) { |
851 | ncp_new_dentry(dentry); |
852 | add_entry: |
853 | dentry->d_op = &ncp_dentry_operations; |
854 | d_add(dentry, inode); |
855 | error = 0; |
856 | } |
857 | |
858 | finished: |
859 | PPRINTK("ncp_lookup: result=%d\n", error); |
860 | unlock_kernel(); |
861 | return ERR_PTR(error); |
862 | } |
863 | |
864 | /* |
865 | * This code is common to create, mkdir, and mknod. |
866 | */ |
867 | static int ncp_instantiate(struct inode *dir, struct dentry *dentry, |
868 | struct ncp_entry_info *finfo) |
869 | { |
870 | struct inode *inode; |
871 | int error = -EINVAL; |
872 | |
873 | finfo->ino = iunique(dir->i_sb, 2); |
874 | inode = ncp_iget(dir->i_sb, finfo); |
875 | if (!inode) |
876 | goto out_close; |
877 | d_instantiate(dentry,inode); |
878 | error = 0; |
879 | out: |
880 | return error; |
881 | |
882 | out_close: |
883 | PPRINTK("ncp_instantiate: %s/%s failed, closing file\n", |
884 | dentry->d_parent->d_name.name, dentry->d_name.name); |
885 | ncp_close_file(NCP_SERVER(dir), finfo->file_handle); |
886 | goto out; |
887 | } |
888 | |
889 | int ncp_create_new(struct inode *dir, struct dentry *dentry, int mode, |
890 | dev_t rdev, __le32 attributes) |
891 | { |
892 | struct ncp_server *server = NCP_SERVER(dir); |
893 | struct ncp_entry_info finfo; |
894 | int error, result, len; |
895 | int opmode; |
896 | __u8 __name[NCP_MAXPATHLEN + 1]; |
897 | |
898 | PPRINTK("ncp_create_new: creating %s/%s, mode=%x\n", |
899 | dentry->d_parent->d_name.name, dentry->d_name.name, mode); |
900 | |
901 | error = -EIO; |
902 | lock_kernel(); |
903 | if (!ncp_conn_valid(server)) |
904 | goto out; |
905 | |
906 | ncp_age_dentry(server, dentry); |
907 | len = sizeof(__name); |
908 | error = ncp_io2vol(server, __name, &len, dentry->d_name.name, |
909 | dentry->d_name.len, !ncp_preserve_case(dir)); |
910 | if (error) |
911 | goto out; |
912 | |
913 | error = -EACCES; |
914 | |
915 | if (S_ISREG(mode) && |
916 | (server->m.flags & NCP_MOUNT_EXTRAS) && |
917 | (mode & S_IXUGO)) |
918 | attributes |= aSYSTEM | aSHARED; |
919 | |
920 | result = ncp_open_create_file_or_subdir(server, dir, __name, |
921 | OC_MODE_CREATE | OC_MODE_OPEN | OC_MODE_REPLACE, |
922 | attributes, AR_READ | AR_WRITE, &finfo); |
923 | opmode = O_RDWR; |
924 | if (result) { |
925 | result = ncp_open_create_file_or_subdir(server, dir, __name, |
926 | OC_MODE_CREATE | OC_MODE_OPEN | OC_MODE_REPLACE, |
927 | attributes, AR_WRITE, &finfo); |
928 | if (result) { |
929 | if (result == 0x87) |
930 | error = -ENAMETOOLONG; |
931 | DPRINTK("ncp_create: %s/%s failed\n", |
932 | dentry->d_parent->d_name.name, dentry->d_name.name); |
933 | goto out; |
934 | } |
935 | opmode = O_WRONLY; |
936 | } |
937 | finfo.access = opmode; |
938 | if (ncp_is_nfs_extras(server, finfo.volume)) { |
939 | finfo.i.nfs.mode = mode; |
940 | finfo.i.nfs.rdev = new_encode_dev(rdev); |
941 | if (ncp_modify_nfs_info(server, finfo.volume, |
942 | finfo.i.dirEntNum, |
943 | mode, new_encode_dev(rdev)) != 0) |
944 | goto out; |
945 | } |
946 | |
947 | error = ncp_instantiate(dir, dentry, &finfo); |
948 | out: |
949 | unlock_kernel(); |
950 | return error; |
951 | } |
952 | |
953 | static int ncp_create(struct inode *dir, struct dentry *dentry, int mode, |
954 | struct nameidata *nd) |
955 | { |
956 | return ncp_create_new(dir, dentry, mode, 0, 0); |
957 | } |
958 | |
959 | static int ncp_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
960 | { |
961 | struct ncp_entry_info finfo; |
962 | struct ncp_server *server = NCP_SERVER(dir); |
963 | int error, len; |
964 | __u8 __name[NCP_MAXPATHLEN + 1]; |
965 | |
966 | DPRINTK("ncp_mkdir: making %s/%s\n", |
967 | dentry->d_parent->d_name.name, dentry->d_name.name); |
968 | |
969 | error = -EIO; |
970 | lock_kernel(); |
971 | if (!ncp_conn_valid(server)) |
972 | goto out; |
973 | |
974 | ncp_age_dentry(server, dentry); |
975 | len = sizeof(__name); |
976 | error = ncp_io2vol(server, __name, &len, dentry->d_name.name, |
977 | dentry->d_name.len, !ncp_preserve_case(dir)); |
978 | if (error) |
979 | goto out; |
980 | |
981 | error = -EACCES; |
982 | if (ncp_open_create_file_or_subdir(server, dir, __name, |
983 | OC_MODE_CREATE, aDIR, |
984 | cpu_to_le16(0xffff), |
985 | &finfo) == 0) |
986 | { |
987 | if (ncp_is_nfs_extras(server, finfo.volume)) { |
988 | mode |= S_IFDIR; |
989 | finfo.i.nfs.mode = mode; |
990 | if (ncp_modify_nfs_info(server, |
991 | finfo.volume, |
992 | finfo.i.dirEntNum, |
993 | mode, 0) != 0) |
994 | goto out; |
995 | } |
996 | error = ncp_instantiate(dir, dentry, &finfo); |
997 | } |
998 | out: |
999 | unlock_kernel(); |
1000 | return error; |
1001 | } |
1002 | |
1003 | static int ncp_rmdir(struct inode *dir, struct dentry *dentry) |
1004 | { |
1005 | struct ncp_server *server = NCP_SERVER(dir); |
1006 | int error, result, len; |
1007 | __u8 __name[NCP_MAXPATHLEN + 1]; |
1008 | |
1009 | DPRINTK("ncp_rmdir: removing %s/%s\n", |
1010 | dentry->d_parent->d_name.name, dentry->d_name.name); |
1011 | |
1012 | error = -EIO; |
1013 | lock_kernel(); |
1014 | if (!ncp_conn_valid(server)) |
1015 | goto out; |
1016 | |
1017 | error = -EBUSY; |
1018 | if (!d_unhashed(dentry)) |
1019 | goto out; |
1020 | |
1021 | len = sizeof(__name); |
1022 | error = ncp_io2vol(server, __name, &len, dentry->d_name.name, |
1023 | dentry->d_name.len, !ncp_preserve_case(dir)); |
1024 | if (error) |
1025 | goto out; |
1026 | |
1027 | result = ncp_del_file_or_subdir(server, dir, __name); |
1028 | switch (result) { |
1029 | case 0x00: |
1030 | error = 0; |
1031 | break; |
1032 | case 0x85: /* unauthorized to delete file */ |
1033 | case 0x8A: /* unauthorized to delete file */ |
1034 | error = -EACCES; |
1035 | break; |
1036 | case 0x8F: |
1037 | case 0x90: /* read only */ |
1038 | error = -EPERM; |
1039 | break; |
1040 | case 0x9F: /* in use by another client */ |
1041 | error = -EBUSY; |
1042 | break; |
1043 | case 0xA0: /* directory not empty */ |
1044 | error = -ENOTEMPTY; |
1045 | break; |
1046 | case 0xFF: /* someone deleted file */ |
1047 | error = -ENOENT; |
1048 | break; |
1049 | default: |
1050 | error = -EACCES; |
1051 | break; |
1052 | } |
1053 | out: |
1054 | unlock_kernel(); |
1055 | return error; |
1056 | } |
1057 | |
1058 | static int ncp_unlink(struct inode *dir, struct dentry *dentry) |
1059 | { |
1060 | struct inode *inode = dentry->d_inode; |
1061 | struct ncp_server *server; |
1062 | int error; |
1063 | |
1064 | lock_kernel(); |
1065 | server = NCP_SERVER(dir); |
1066 | DPRINTK("ncp_unlink: unlinking %s/%s\n", |
1067 | dentry->d_parent->d_name.name, dentry->d_name.name); |
1068 | |
1069 | error = -EIO; |
1070 | if (!ncp_conn_valid(server)) |
1071 | goto out; |
1072 | |
1073 | /* |
1074 | * Check whether to close the file ... |
1075 | */ |
1076 | if (inode) { |
1077 | PPRINTK("ncp_unlink: closing file\n"); |
1078 | ncp_make_closed(inode); |
1079 | } |
1080 | |
1081 | error = ncp_del_file_or_subdir2(server, dentry); |
1082 | #ifdef CONFIG_NCPFS_STRONG |
1083 | /* 9C is Invalid path.. It should be 8F, 90 - read only, but |
1084 | it is not :-( */ |
1085 | if ((error == 0x9C || error == 0x90) && server->m.flags & NCP_MOUNT_STRONG) { /* R/O */ |
1086 | error = ncp_force_unlink(dir, dentry); |
1087 | } |
1088 | #endif |
1089 | switch (error) { |
1090 | case 0x00: |
1091 | DPRINTK("ncp: removed %s/%s\n", |
1092 | dentry->d_parent->d_name.name, dentry->d_name.name); |
1093 | break; |
1094 | case 0x85: |
1095 | case 0x8A: |
1096 | error = -EACCES; |
1097 | break; |
1098 | case 0x8D: /* some files in use */ |
1099 | case 0x8E: /* all files in use */ |
1100 | error = -EBUSY; |
1101 | break; |
1102 | case 0x8F: /* some read only */ |
1103 | case 0x90: /* all read only */ |
1104 | case 0x9C: /* !!! returned when in-use or read-only by NW4 */ |
1105 | error = -EPERM; |
1106 | break; |
1107 | case 0xFF: |
1108 | error = -ENOENT; |
1109 | break; |
1110 | default: |
1111 | error = -EACCES; |
1112 | break; |
1113 | } |
1114 | |
1115 | out: |
1116 | unlock_kernel(); |
1117 | return error; |
1118 | } |
1119 | |
1120 | static int ncp_rename(struct inode *old_dir, struct dentry *old_dentry, |
1121 | struct inode *new_dir, struct dentry *new_dentry) |
1122 | { |
1123 | struct ncp_server *server = NCP_SERVER(old_dir); |
1124 | int error; |
1125 | int old_len, new_len; |
1126 | __u8 __old_name[NCP_MAXPATHLEN + 1], __new_name[NCP_MAXPATHLEN + 1]; |
1127 | |
1128 | DPRINTK("ncp_rename: %s/%s to %s/%s\n", |
1129 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, |
1130 | new_dentry->d_parent->d_name.name, new_dentry->d_name.name); |
1131 | |
1132 | error = -EIO; |
1133 | lock_kernel(); |
1134 | if (!ncp_conn_valid(server)) |
1135 | goto out; |
1136 | |
1137 | ncp_age_dentry(server, old_dentry); |
1138 | ncp_age_dentry(server, new_dentry); |
1139 | |
1140 | old_len = sizeof(__old_name); |
1141 | error = ncp_io2vol(server, __old_name, &old_len, |
1142 | old_dentry->d_name.name, old_dentry->d_name.len, |
1143 | !ncp_preserve_case(old_dir)); |
1144 | if (error) |
1145 | goto out; |
1146 | |
1147 | new_len = sizeof(__new_name); |
1148 | error = ncp_io2vol(server, __new_name, &new_len, |
1149 | new_dentry->d_name.name, new_dentry->d_name.len, |
1150 | !ncp_preserve_case(new_dir)); |
1151 | if (error) |
1152 | goto out; |
1153 | |
1154 | error = ncp_ren_or_mov_file_or_subdir(server, old_dir, __old_name, |
1155 | new_dir, __new_name); |
1156 | #ifdef CONFIG_NCPFS_STRONG |
1157 | if ((error == 0x90 || error == 0x8B || error == -EACCES) && |
1158 | server->m.flags & NCP_MOUNT_STRONG) { /* RO */ |
1159 | error = ncp_force_rename(old_dir, old_dentry, __old_name, |
1160 | new_dir, new_dentry, __new_name); |
1161 | } |
1162 | #endif |
1163 | switch (error) { |
1164 | case 0x00: |
1165 | DPRINTK("ncp renamed %s -> %s.\n", |
1166 | old_dentry->d_name.name,new_dentry->d_name.name); |
1167 | break; |
1168 | case 0x9E: |
1169 | error = -ENAMETOOLONG; |
1170 | break; |
1171 | case 0xFF: |
1172 | error = -ENOENT; |
1173 | break; |
1174 | default: |
1175 | error = -EACCES; |
1176 | break; |
1177 | } |
1178 | out: |
1179 | unlock_kernel(); |
1180 | return error; |
1181 | } |
1182 | |
1183 | static int ncp_mknod(struct inode * dir, struct dentry *dentry, |
1184 | int mode, dev_t rdev) |
1185 | { |
1186 | if (!new_valid_dev(rdev)) |
1187 | return -EINVAL; |
1188 | if (ncp_is_nfs_extras(NCP_SERVER(dir), NCP_FINFO(dir)->volNumber)) { |
1189 | DPRINTK(KERN_DEBUG "ncp_mknod: mode = 0%o\n", mode); |
1190 | return ncp_create_new(dir, dentry, mode, rdev, 0); |
1191 | } |
1192 | return -EPERM; /* Strange, but true */ |
1193 | } |
1194 | |
1195 | /* The following routines are taken directly from msdos-fs */ |
1196 | |
1197 | /* Linear day numbers of the respective 1sts in non-leap years. */ |
1198 | |
1199 | static int day_n[] = |
1200 | {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 0, 0, 0, 0}; |
1201 | /* Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec */ |
1202 | |
1203 | |
1204 | extern struct timezone sys_tz; |
1205 | |
1206 | static int utc2local(int time) |
1207 | { |
1208 | return time - sys_tz.tz_minuteswest * 60; |
1209 | } |
1210 | |
1211 | static int local2utc(int time) |
1212 | { |
1213 | return time + sys_tz.tz_minuteswest * 60; |
1214 | } |
1215 | |
1216 | /* Convert a MS-DOS time/date pair to a UNIX date (seconds since 1 1 70). */ |
1217 | int |
1218 | ncp_date_dos2unix(__le16 t, __le16 d) |
1219 | { |
1220 | unsigned short time = le16_to_cpu(t), date = le16_to_cpu(d); |
1221 | int month, year, secs; |
1222 | |
1223 | /* first subtract and mask after that... Otherwise, if |
1224 | date == 0, bad things happen */ |
1225 | month = ((date >> 5) - 1) & 15; |
1226 | year = date >> 9; |
1227 | secs = (time & 31) * 2 + 60 * ((time >> 5) & 63) + (time >> 11) * 3600 + |
1228 | 86400 * ((date & 31) - 1 + day_n[month] + (year / 4) + |
1229 | year * 365 - ((year & 3) == 0 && month < 2 ? 1 : 0) + 3653); |
1230 | /* days since 1.1.70 plus 80's leap day */ |
1231 | return local2utc(secs); |
1232 | } |
1233 | |
1234 | |
1235 | /* Convert linear UNIX date to a MS-DOS time/date pair. */ |
1236 | void |
1237 | ncp_date_unix2dos(int unix_date, __le16 *time, __le16 *date) |
1238 | { |
1239 | int day, year, nl_day, month; |
1240 | |
1241 | unix_date = utc2local(unix_date); |
1242 | *time = cpu_to_le16( |
1243 | (unix_date % 60) / 2 + (((unix_date / 60) % 60) << 5) + |
1244 | (((unix_date / 3600) % 24) << 11)); |
1245 | day = unix_date / 86400 - 3652; |
1246 | year = day / 365; |
1247 | if ((year + 3) / 4 + 365 * year > day) |
1248 | year--; |
1249 | day -= (year + 3) / 4 + 365 * year; |
1250 | if (day == 59 && !(year & 3)) { |
1251 | nl_day = day; |
1252 | month = 2; |
1253 | } else { |
1254 | nl_day = (year & 3) || day <= 59 ? day : day - 1; |
1255 | for (month = 0; month < 12; month++) |
1256 | if (day_n[month] > nl_day) |
1257 | break; |
1258 | } |
1259 | *date = cpu_to_le16(nl_day - day_n[month - 1] + 1 + (month << 5) + (year << 9)); |
1260 | } |