fs/: do not fallback to default_llseek() when readdir() uses BKL
[linux-2.6.git] / fs / ncpfs / dir.c
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
14 #include <linux/time.h>
15 #include <linux/errno.h>
16 #include <linux/stat.h>
17 #include <linux/kernel.h>
18 #include <linux/vmalloc.h>
19 #include <linux/mm.h>
20 #include <asm/uaccess.h>
21 #include <asm/byteorder.h>
22 #include <linux/smp_lock.h>
23
24 #include <linux/ncp_fs.h>
25
26 #include "ncplib_kernel.h"
27
28 static void ncp_read_volume_list(struct file *, void *, filldir_t,
29                                 struct ncp_cache_control *);
30 static void ncp_do_readdir(struct file *, void *, filldir_t,
31                                 struct ncp_cache_control *);
32
33 static int ncp_readdir(struct file *, void *, filldir_t);
34
35 static int ncp_create(struct inode *, struct dentry *, int, struct nameidata *);
36 static struct dentry *ncp_lookup(struct inode *, struct dentry *, struct nameidata *);
37 static int ncp_unlink(struct inode *, struct dentry *);
38 static int ncp_mkdir(struct inode *, struct dentry *, int);
39 static int ncp_rmdir(struct inode *, struct dentry *);
40 static int ncp_rename(struct inode *, struct dentry *,
41                       struct inode *, struct dentry *);
42 static int ncp_mknod(struct inode * dir, struct dentry *dentry,
43                      int mode, dev_t rdev);
44 #if defined(CONFIG_NCPFS_EXTRAS) || defined(CONFIG_NCPFS_NFS_NS)
45 extern int ncp_symlink(struct inode *, struct dentry *, const char *);
46 #else
47 #define ncp_symlink NULL
48 #endif
49                       
50 const struct file_operations ncp_dir_operations =
51 {
52         .llseek         = generic_file_llseek,
53         .read           = generic_read_dir,
54         .readdir        = ncp_readdir,
55         .unlocked_ioctl = ncp_ioctl,
56 #ifdef CONFIG_COMPAT
57         .compat_ioctl   = ncp_compat_ioctl,
58 #endif
59 };
60
61 const struct inode_operations ncp_dir_inode_operations =
62 {
63         .create         = ncp_create,
64         .lookup         = ncp_lookup,
65         .unlink         = ncp_unlink,
66         .symlink        = ncp_symlink,
67         .mkdir          = ncp_mkdir,
68         .rmdir          = ncp_rmdir,
69         .mknod          = ncp_mknod,
70         .rename         = ncp_rename,
71         .setattr        = ncp_notify_change,
72 };
73
74 /*
75  * Dentry operations routines
76  */
77 static int ncp_lookup_validate(struct dentry *, struct nameidata *);
78 static int ncp_hash_dentry(struct dentry *, struct qstr *);
79 static int ncp_compare_dentry (struct dentry *, struct qstr *, struct qstr *);
80 static int ncp_delete_dentry(struct dentry *);
81
82 static const struct dentry_operations ncp_dentry_operations =
83 {
84         .d_revalidate   = ncp_lookup_validate,
85         .d_hash         = ncp_hash_dentry,
86         .d_compare      = ncp_compare_dentry,
87         .d_delete       = ncp_delete_dentry,
88 };
89
90 const struct dentry_operations ncp_root_dentry_operations =
91 {
92         .d_hash         = ncp_hash_dentry,
93         .d_compare      = ncp_compare_dentry,
94         .d_delete       = ncp_delete_dentry,
95 };
96
97
98 /*
99  * Note: leave the hash unchanged if the directory
100  * is case-sensitive.
101  */
102 static int 
103 ncp_hash_dentry(struct dentry *dentry, struct qstr *this)
104 {
105         struct nls_table *t;
106         unsigned long hash;
107         int i;
108
109         t = NCP_IO_TABLE(dentry);
110
111         if (!ncp_case_sensitive(dentry->d_inode)) {
112                 hash = init_name_hash();
113                 for (i=0; i<this->len ; i++)
114                         hash = partial_name_hash(ncp_tolower(t, this->name[i]),
115                                                                         hash);
116                 this->hash = end_name_hash(hash);
117         }
118         return 0;
119 }
120
121 static int
122 ncp_compare_dentry(struct dentry *dentry, struct qstr *a, struct qstr *b)
123 {
124         if (a->len != b->len)
125                 return 1;
126
127         if (ncp_case_sensitive(dentry->d_inode))
128                 return strncmp(a->name, b->name, a->len);
129
130         return ncp_strnicmp(NCP_IO_TABLE(dentry), a->name, b->name, a->len);
131 }
132
133 /*
134  * This is the callback from dput() when d_count is going to 0.
135  * We use this to unhash dentries with bad inodes.
136  * Closing files can be safely postponed until iput() - it's done there anyway.
137  */
138 static int
139 ncp_delete_dentry(struct dentry * dentry)
140 {
141         struct inode *inode = dentry->d_inode;
142
143         if (inode) {
144                 if (is_bad_inode(inode))
145                         return 1;
146         } else
147         {
148         /* N.B. Unhash negative dentries? */
149         }
150         return 0;
151 }
152
153 static inline int
154 ncp_single_volume(struct ncp_server *server)
155 {
156         return (server->m.mounted_vol[0] != '\0');
157 }
158
159 static inline int ncp_is_server_root(struct inode *inode)
160 {
161         return (!ncp_single_volume(NCP_SERVER(inode)) &&
162                 inode == inode->i_sb->s_root->d_inode);
163 }
164
165
166 /*
167  * This is the callback when the dcache has a lookup hit.
168  */
169
170
171 #ifdef CONFIG_NCPFS_STRONG
172 /* try to delete a readonly file (NW R bit set) */
173
174 static int
175 ncp_force_unlink(struct inode *dir, struct dentry* dentry)
176 {
177         int res=0x9c,res2;
178         struct nw_modify_dos_info info;
179         __le32 old_nwattr;
180         struct inode *inode;
181
182         memset(&info, 0, sizeof(info));
183         
184         /* remove the Read-Only flag on the NW server */
185         inode = dentry->d_inode;
186
187         old_nwattr = NCP_FINFO(inode)->nwattr;
188         info.attributes = old_nwattr & ~(aRONLY|aDELETEINHIBIT|aRENAMEINHIBIT);
189         res2 = ncp_modify_file_or_subdir_dos_info_path(NCP_SERVER(inode), inode, NULL, DM_ATTRIBUTES, &info);
190         if (res2)
191                 goto leave_me;
192
193         /* now try again the delete operation */
194         res = ncp_del_file_or_subdir2(NCP_SERVER(dir), dentry);
195
196         if (res)  /* delete failed, set R bit again */
197         {
198                 info.attributes = old_nwattr;
199                 res2 = ncp_modify_file_or_subdir_dos_info_path(NCP_SERVER(inode), inode, NULL, DM_ATTRIBUTES, &info);
200                 if (res2)
201                         goto leave_me;
202         }
203 leave_me:
204         return(res);
205 }
206 #endif  /* CONFIG_NCPFS_STRONG */
207
208 #ifdef CONFIG_NCPFS_STRONG
209 static int
210 ncp_force_rename(struct inode *old_dir, struct dentry* old_dentry, char *_old_name,
211                  struct inode *new_dir, struct dentry* new_dentry, char *_new_name)
212 {
213         struct nw_modify_dos_info info;
214         int res=0x90,res2;
215         struct inode *old_inode = old_dentry->d_inode;
216         __le32 old_nwattr = NCP_FINFO(old_inode)->nwattr;
217         __le32 new_nwattr = 0; /* shut compiler warning */
218         int old_nwattr_changed = 0;
219         int new_nwattr_changed = 0;
220
221         memset(&info, 0, sizeof(info));
222         
223         /* remove the Read-Only flag on the NW server */
224
225         info.attributes = old_nwattr & ~(aRONLY|aRENAMEINHIBIT|aDELETEINHIBIT);
226         res2 = ncp_modify_file_or_subdir_dos_info_path(NCP_SERVER(old_inode), old_inode, NULL, DM_ATTRIBUTES, &info);
227         if (!res2)
228                 old_nwattr_changed = 1;
229         if (new_dentry && new_dentry->d_inode) {
230                 new_nwattr = NCP_FINFO(new_dentry->d_inode)->nwattr;
231                 info.attributes = new_nwattr & ~(aRONLY|aRENAMEINHIBIT|aDELETEINHIBIT);
232                 res2 = ncp_modify_file_or_subdir_dos_info_path(NCP_SERVER(new_dir), new_dir, _new_name, DM_ATTRIBUTES, &info);
233                 if (!res2)
234                         new_nwattr_changed = 1;
235         }
236         /* now try again the rename operation */
237         /* but only if something really happened */
238         if (new_nwattr_changed || old_nwattr_changed) {
239                 res = ncp_ren_or_mov_file_or_subdir(NCP_SERVER(old_dir),
240                                                     old_dir, _old_name,
241                                                     new_dir, _new_name);
242         } 
243         if (res)
244                 goto leave_me;
245         /* file was successfully renamed, so:
246            do not set attributes on old file - it no longer exists
247            copy attributes from old file to new */
248         new_nwattr_changed = old_nwattr_changed;
249         new_nwattr = old_nwattr;
250         old_nwattr_changed = 0;
251         
252 leave_me:;
253         if (old_nwattr_changed) {
254                 info.attributes = old_nwattr;
255                 res2 = ncp_modify_file_or_subdir_dos_info_path(NCP_SERVER(old_inode), old_inode, NULL, DM_ATTRIBUTES, &info);
256                 /* ignore errors */
257         }
258         if (new_nwattr_changed) {
259                 info.attributes = new_nwattr;
260                 res2 = ncp_modify_file_or_subdir_dos_info_path(NCP_SERVER(new_dir), new_dir, _new_name, DM_ATTRIBUTES, &info);
261                 /* ignore errors */
262         }
263         return(res);
264 }
265 #endif  /* CONFIG_NCPFS_STRONG */
266
267
268 static int
269 __ncp_lookup_validate(struct dentry *dentry)
270 {
271         struct ncp_server *server;
272         struct dentry *parent;
273         struct inode *dir;
274         struct ncp_entry_info finfo;
275         int res, val = 0, len;
276         __u8 __name[NCP_MAXPATHLEN + 1];
277
278         parent = dget_parent(dentry);
279         dir = parent->d_inode;
280
281         if (!dentry->d_inode)
282                 goto finished;
283
284         server = NCP_SERVER(dir);
285
286         if (!ncp_conn_valid(server))
287                 goto finished;
288
289         /*
290          * Inspired by smbfs:
291          * The default validation is based on dentry age:
292          * We set the max age at mount time.  (But each
293          * successful server lookup renews the timestamp.)
294          */
295         val = NCP_TEST_AGE(server, dentry);
296         if (val)
297                 goto finished;
298
299         DDPRINTK("ncp_lookup_validate: %s/%s not valid, age=%ld, server lookup\n",
300                 dentry->d_parent->d_name.name, dentry->d_name.name,
301                 NCP_GET_AGE(dentry));
302
303         len = sizeof(__name);
304         if (ncp_is_server_root(dir)) {
305                 res = ncp_io2vol(server, __name, &len, dentry->d_name.name,
306                                  dentry->d_name.len, 1);
307                 if (!res)
308                         res = ncp_lookup_volume(server, __name, &(finfo.i));
309         } else {
310                 res = ncp_io2vol(server, __name, &len, dentry->d_name.name,
311                                  dentry->d_name.len, !ncp_preserve_case(dir));
312                 if (!res)
313                         res = ncp_obtain_info(server, dir, __name, &(finfo.i));
314         }
315         finfo.volume = finfo.i.volNumber;
316         DDPRINTK("ncp_lookup_validate: looked for %s/%s, res=%d\n",
317                 dentry->d_parent->d_name.name, __name, res);
318         /*
319          * If we didn't find it, or if it has a different dirEntNum to
320          * what we remember, it's not valid any more.
321          */
322         if (!res) {
323                 if (finfo.i.dirEntNum == NCP_FINFO(dentry->d_inode)->dirEntNum) {
324                         ncp_new_dentry(dentry);
325                         val=1;
326                 } else
327                         DDPRINTK("ncp_lookup_validate: found, but dirEntNum changed\n");
328
329                 ncp_update_inode2(dentry->d_inode, &finfo);
330         }
331
332 finished:
333         DDPRINTK("ncp_lookup_validate: result=%d\n", val);
334         dput(parent);
335         return val;
336 }
337
338 static int
339 ncp_lookup_validate(struct dentry * dentry, struct nameidata *nd)
340 {
341         int res;
342         lock_kernel();
343         res = __ncp_lookup_validate(dentry);
344         unlock_kernel();
345         return res;
346 }
347
348 static struct dentry *
349 ncp_dget_fpos(struct dentry *dentry, struct dentry *parent, unsigned long fpos)
350 {
351         struct dentry *dent = dentry;
352         struct list_head *next;
353
354         if (d_validate(dent, parent)) {
355                 if (dent->d_name.len <= NCP_MAXPATHLEN &&
356                     (unsigned long)dent->d_fsdata == fpos) {
357                         if (!dent->d_inode) {
358                                 dput(dent);
359                                 dent = NULL;
360                         }
361                         return dent;
362                 }
363                 dput(dent);
364         }
365
366         /* If a pointer is invalid, we search the dentry. */
367         spin_lock(&dcache_lock);
368         next = parent->d_subdirs.next;
369         while (next != &parent->d_subdirs) {
370                 dent = list_entry(next, struct dentry, d_u.d_child);
371                 if ((unsigned long)dent->d_fsdata == fpos) {
372                         if (dent->d_inode)
373                                 dget_locked(dent);
374                         else
375                                 dent = NULL;
376                         spin_unlock(&dcache_lock);
377                         goto out;
378                 }
379                 next = next->next;
380         }
381         spin_unlock(&dcache_lock);
382         return NULL;
383
384 out:
385         return dent;
386 }
387
388 static time_t ncp_obtain_mtime(struct dentry *dentry)
389 {
390         struct inode *inode = dentry->d_inode;
391         struct ncp_server *server = NCP_SERVER(inode);
392         struct nw_info_struct i;
393
394         if (!ncp_conn_valid(server) || ncp_is_server_root(inode))
395                 return 0;
396
397         if (ncp_obtain_info(server, inode, NULL, &i))
398                 return 0;
399
400         return ncp_date_dos2unix(i.modifyTime, i.modifyDate);
401 }
402
403 static int ncp_readdir(struct file *filp, void *dirent, filldir_t filldir)
404 {
405         struct dentry *dentry = filp->f_path.dentry;
406         struct inode *inode = dentry->d_inode;
407         struct page *page = NULL;
408         struct ncp_server *server = NCP_SERVER(inode);
409         union  ncp_dir_cache *cache = NULL;
410         struct ncp_cache_control ctl;
411         int result, mtime_valid = 0;
412         time_t mtime = 0;
413
414         lock_kernel();
415
416         ctl.page  = NULL;
417         ctl.cache = NULL;
418
419         DDPRINTK("ncp_readdir: reading %s/%s, pos=%d\n",
420                 dentry->d_parent->d_name.name, dentry->d_name.name,
421                 (int) filp->f_pos);
422
423         result = -EIO;
424         if (!ncp_conn_valid(server))
425                 goto out;
426
427         result = 0;
428         if (filp->f_pos == 0) {
429                 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR))
430                         goto out;
431                 filp->f_pos = 1;
432         }
433         if (filp->f_pos == 1) {
434                 if (filldir(dirent, "..", 2, 1, parent_ino(dentry), DT_DIR))
435                         goto out;
436                 filp->f_pos = 2;
437         }
438
439         page = grab_cache_page(&inode->i_data, 0);
440         if (!page)
441                 goto read_really;
442
443         ctl.cache = cache = kmap(page);
444         ctl.head  = cache->head;
445
446         if (!PageUptodate(page) || !ctl.head.eof)
447                 goto init_cache;
448
449         if (filp->f_pos == 2) {
450                 if (jiffies - ctl.head.time >= NCP_MAX_AGE(server))
451                         goto init_cache;
452
453                 mtime = ncp_obtain_mtime(dentry);
454                 mtime_valid = 1;
455                 if ((!mtime) || (mtime != ctl.head.mtime))
456                         goto init_cache;
457         }
458
459         if (filp->f_pos > ctl.head.end)
460                 goto finished;
461
462         ctl.fpos = filp->f_pos + (NCP_DIRCACHE_START - 2);
463         ctl.ofs  = ctl.fpos / NCP_DIRCACHE_SIZE;
464         ctl.idx  = ctl.fpos % NCP_DIRCACHE_SIZE;
465
466         for (;;) {
467                 if (ctl.ofs != 0) {
468                         ctl.page = find_lock_page(&inode->i_data, ctl.ofs);
469                         if (!ctl.page)
470                                 goto invalid_cache;
471                         ctl.cache = kmap(ctl.page);
472                         if (!PageUptodate(ctl.page))
473                                 goto invalid_cache;
474                 }
475                 while (ctl.idx < NCP_DIRCACHE_SIZE) {
476                         struct dentry *dent;
477                         int res;
478
479                         dent = ncp_dget_fpos(ctl.cache->dentry[ctl.idx],
480                                                 dentry, filp->f_pos);
481                         if (!dent)
482                                 goto invalid_cache;
483                         res = filldir(dirent, dent->d_name.name,
484                                         dent->d_name.len, filp->f_pos,
485                                         dent->d_inode->i_ino, DT_UNKNOWN);
486                         dput(dent);
487                         if (res)
488                                 goto finished;
489                         filp->f_pos += 1;
490                         ctl.idx += 1;
491                         if (filp->f_pos > ctl.head.end)
492                                 goto finished;
493                 }
494                 if (ctl.page) {
495                         kunmap(ctl.page);
496                         SetPageUptodate(ctl.page);
497                         unlock_page(ctl.page);
498                         page_cache_release(ctl.page);
499                         ctl.page = NULL;
500                 }
501                 ctl.idx  = 0;
502                 ctl.ofs += 1;
503         }
504 invalid_cache:
505         if (ctl.page) {
506                 kunmap(ctl.page);
507                 unlock_page(ctl.page);
508                 page_cache_release(ctl.page);
509                 ctl.page = NULL;
510         }
511         ctl.cache = cache;
512 init_cache:
513         ncp_invalidate_dircache_entries(dentry);
514         if (!mtime_valid) {
515                 mtime = ncp_obtain_mtime(dentry);
516                 mtime_valid = 1;
517         }
518         ctl.head.mtime = mtime;
519         ctl.head.time = jiffies;
520         ctl.head.eof = 0;
521         ctl.fpos = 2;
522         ctl.ofs = 0;
523         ctl.idx = NCP_DIRCACHE_START;
524         ctl.filled = 0;
525         ctl.valid  = 1;
526 read_really:
527         if (ncp_is_server_root(inode)) {
528                 ncp_read_volume_list(filp, dirent, filldir, &ctl);
529         } else {
530                 ncp_do_readdir(filp, dirent, filldir, &ctl);
531         }
532         ctl.head.end = ctl.fpos - 1;
533         ctl.head.eof = ctl.valid;
534 finished:
535         if (page) {
536                 cache->head = ctl.head;
537                 kunmap(page);
538                 SetPageUptodate(page);
539                 unlock_page(page);
540                 page_cache_release(page);
541         }
542         if (ctl.page) {
543                 kunmap(ctl.page);
544                 SetPageUptodate(ctl.page);
545                 unlock_page(ctl.page);
546                 page_cache_release(ctl.page);
547         }
548 out:
549         unlock_kernel();
550         return result;
551 }
552
553 static int
554 ncp_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
555                 struct ncp_cache_control *ctrl, struct ncp_entry_info *entry)
556 {
557         struct dentry *newdent, *dentry = filp->f_path.dentry;
558         struct inode *newino, *inode = dentry->d_inode;
559         struct ncp_cache_control ctl = *ctrl;
560         struct qstr qname;
561         int valid = 0;
562         int hashed = 0;
563         ino_t ino = 0;
564         __u8 __name[NCP_MAXPATHLEN + 1];
565
566         qname.len = sizeof(__name);
567         if (ncp_vol2io(NCP_SERVER(inode), __name, &qname.len,
568                         entry->i.entryName, entry->i.nameLen,
569                         !ncp_preserve_entry_case(inode, entry->i.NSCreator)))
570                 return 1; /* I'm not sure */
571
572         qname.name = __name;
573         qname.hash = full_name_hash(qname.name, qname.len);
574
575         if (dentry->d_op && dentry->d_op->d_hash)
576                 if (dentry->d_op->d_hash(dentry, &qname) != 0)
577                         goto end_advance;
578
579         newdent = d_lookup(dentry, &qname);
580
581         if (!newdent) {
582                 newdent = d_alloc(dentry, &qname);
583                 if (!newdent)
584                         goto end_advance;
585         } else {
586                 hashed = 1;
587                 memcpy((char *) newdent->d_name.name, qname.name,
588                                                         newdent->d_name.len);
589         }
590
591         if (!newdent->d_inode) {
592                 entry->opened = 0;
593                 entry->ino = iunique(inode->i_sb, 2);
594                 newino = ncp_iget(inode->i_sb, entry);
595                 if (newino) {
596                         newdent->d_op = &ncp_dentry_operations;
597                         d_instantiate(newdent, newino);
598                         if (!hashed)
599                                 d_rehash(newdent);
600                 }
601         } else
602                 ncp_update_inode2(newdent->d_inode, entry);
603
604         if (newdent->d_inode) {
605                 ino = newdent->d_inode->i_ino;
606                 newdent->d_fsdata = (void *) ctl.fpos;
607                 ncp_new_dentry(newdent);
608         }
609
610         if (ctl.idx >= NCP_DIRCACHE_SIZE) {
611                 if (ctl.page) {
612                         kunmap(ctl.page);
613                         SetPageUptodate(ctl.page);
614                         unlock_page(ctl.page);
615                         page_cache_release(ctl.page);
616                 }
617                 ctl.cache = NULL;
618                 ctl.idx  -= NCP_DIRCACHE_SIZE;
619                 ctl.ofs  += 1;
620                 ctl.page  = grab_cache_page(&inode->i_data, ctl.ofs);
621                 if (ctl.page)
622                         ctl.cache = kmap(ctl.page);
623         }
624         if (ctl.cache) {
625                 ctl.cache->dentry[ctl.idx] = newdent;
626                 valid = 1;
627         }
628         dput(newdent);
629 end_advance:
630         if (!valid)
631                 ctl.valid = 0;
632         if (!ctl.filled && (ctl.fpos == filp->f_pos)) {
633                 if (!ino)
634                         ino = find_inode_number(dentry, &qname);
635                 if (!ino)
636                         ino = iunique(inode->i_sb, 2);
637                 ctl.filled = filldir(dirent, qname.name, qname.len,
638                                      filp->f_pos, ino, DT_UNKNOWN);
639                 if (!ctl.filled)
640                         filp->f_pos += 1;
641         }
642         ctl.fpos += 1;
643         ctl.idx  += 1;
644         *ctrl = ctl;
645         return (ctl.valid || !ctl.filled);
646 }
647
648 static void
649 ncp_read_volume_list(struct file *filp, void *dirent, filldir_t filldir,
650                         struct ncp_cache_control *ctl)
651 {
652         struct dentry *dentry = filp->f_path.dentry;
653         struct inode *inode = dentry->d_inode;
654         struct ncp_server *server = NCP_SERVER(inode);
655         struct ncp_volume_info info;
656         struct ncp_entry_info entry;
657         int i;
658
659         DPRINTK("ncp_read_volume_list: pos=%ld\n",
660                         (unsigned long) filp->f_pos);
661
662         for (i = 0; i < NCP_NUMBER_OF_VOLUMES; i++) {
663
664                 if (ncp_get_volume_info_with_number(server, i, &info) != 0)
665                         return;
666                 if (!strlen(info.volume_name))
667                         continue;
668
669                 DPRINTK("ncp_read_volume_list: found vol: %s\n",
670                         info.volume_name);
671
672                 if (ncp_lookup_volume(server, info.volume_name,
673                                         &entry.i)) {
674                         DPRINTK("ncpfs: could not lookup vol %s\n",
675                                 info.volume_name);
676                         continue;
677                 }
678                 entry.volume = entry.i.volNumber;
679                 if (!ncp_fill_cache(filp, dirent, filldir, ctl, &entry))
680                         return;
681         }
682 }
683
684 static void
685 ncp_do_readdir(struct file *filp, void *dirent, filldir_t filldir,
686                                                 struct ncp_cache_control *ctl)
687 {
688         struct dentry *dentry = filp->f_path.dentry;
689         struct inode *dir = dentry->d_inode;
690         struct ncp_server *server = NCP_SERVER(dir);
691         struct nw_search_sequence seq;
692         struct ncp_entry_info entry;
693         int err;
694         void* buf;
695         int more;
696         size_t bufsize;
697
698         DPRINTK("ncp_do_readdir: %s/%s, fpos=%ld\n",
699                 dentry->d_parent->d_name.name, dentry->d_name.name,
700                 (unsigned long) filp->f_pos);
701         PPRINTK("ncp_do_readdir: init %s, volnum=%d, dirent=%u\n",
702                 dentry->d_name.name, NCP_FINFO(dir)->volNumber,
703                 NCP_FINFO(dir)->dirEntNum);
704
705         err = ncp_initialize_search(server, dir, &seq);
706         if (err) {
707                 DPRINTK("ncp_do_readdir: init failed, err=%d\n", err);
708                 return;
709         }
710         /* We MUST NOT use server->buffer_size handshaked with server if we are
711            using UDP, as for UDP server uses max. buffer size determined by
712            MTU, and for TCP server uses hardwired value 65KB (== 66560 bytes). 
713            So we use 128KB, just to be sure, as there is no way how to know
714            this value in advance. */
715         bufsize = 131072;
716         buf = vmalloc(bufsize);
717         if (!buf)
718                 return;
719         do {
720                 int cnt;
721                 char* rpl;
722                 size_t rpls;
723
724                 err = ncp_search_for_fileset(server, &seq, &more, &cnt, buf, bufsize, &rpl, &rpls);
725                 if (err)                /* Error */
726                         break;
727                 if (!cnt)               /* prevent endless loop */
728                         break;
729                 while (cnt--) {
730                         size_t onerpl;
731                         
732                         if (rpls < offsetof(struct nw_info_struct, entryName))
733                                 break;  /* short packet */
734                         ncp_extract_file_info(rpl, &entry.i);
735                         onerpl = offsetof(struct nw_info_struct, entryName) + entry.i.nameLen;
736                         if (rpls < onerpl)
737                                 break;  /* short packet */
738                         (void)ncp_obtain_nfs_info(server, &entry.i);
739                         rpl += onerpl;
740                         rpls -= onerpl;
741                         entry.volume = entry.i.volNumber;
742                         if (!ncp_fill_cache(filp, dirent, filldir, ctl, &entry))
743                                 break;
744                 }
745         } while (more);
746         vfree(buf);
747         return;
748 }
749
750 int ncp_conn_logged_in(struct super_block *sb)
751 {
752         struct ncp_server* server = NCP_SBP(sb);
753         int result;
754
755         if (ncp_single_volume(server)) {
756                 int len;
757                 struct dentry* dent;
758                 __u32 volNumber;
759                 __le32 dirEntNum;
760                 __le32 DosDirNum;
761                 __u8 __name[NCP_MAXPATHLEN + 1];
762
763                 len = sizeof(__name);
764                 result = ncp_io2vol(server, __name, &len, server->m.mounted_vol,
765                                     strlen(server->m.mounted_vol), 1);
766                 if (result)
767                         goto out;
768                 result = -ENOENT;
769                 if (ncp_get_volume_root(server, __name, &volNumber, &dirEntNum, &DosDirNum)) {
770                         PPRINTK("ncp_conn_logged_in: %s not found\n",
771                                 server->m.mounted_vol);
772                         goto out;
773                 }
774                 dent = sb->s_root;
775                 if (dent) {
776                         struct inode* ino = dent->d_inode;
777                         if (ino) {
778                                 NCP_FINFO(ino)->volNumber = volNumber;
779                                 NCP_FINFO(ino)->dirEntNum = dirEntNum;
780                                 NCP_FINFO(ino)->DosDirNum = DosDirNum;
781                         } else {
782                                 DPRINTK("ncpfs: sb->s_root->d_inode == NULL!\n");
783                         }
784                 } else {
785                         DPRINTK("ncpfs: sb->s_root == NULL!\n");
786                 }
787         }
788         result = 0;
789
790 out:
791         return result;
792 }
793
794 static struct dentry *ncp_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
795 {
796         struct ncp_server *server = NCP_SERVER(dir);
797         struct inode *inode = NULL;
798         struct ncp_entry_info finfo;
799         int error, res, len;
800         __u8 __name[NCP_MAXPATHLEN + 1];
801
802         lock_kernel();
803         error = -EIO;
804         if (!ncp_conn_valid(server))
805                 goto finished;
806
807         PPRINTK("ncp_lookup: server lookup for %s/%s\n",
808                 dentry->d_parent->d_name.name, dentry->d_name.name);
809
810         len = sizeof(__name);
811         if (ncp_is_server_root(dir)) {
812                 res = ncp_io2vol(server, __name, &len, dentry->d_name.name,
813                                  dentry->d_name.len, 1);
814                 if (!res)
815                         res = ncp_lookup_volume(server, __name, &(finfo.i));
816         } else {
817                 res = ncp_io2vol(server, __name, &len, dentry->d_name.name,
818                                  dentry->d_name.len, !ncp_preserve_case(dir));
819                 if (!res)
820                         res = ncp_obtain_info(server, dir, __name, &(finfo.i));
821         }
822         PPRINTK("ncp_lookup: looked for %s/%s, res=%d\n",
823                 dentry->d_parent->d_name.name, __name, res);
824         /*
825          * If we didn't find an entry, make a negative dentry.
826          */
827         if (res)
828                 goto add_entry;
829
830         /*
831          * Create an inode for the entry.
832          */
833         finfo.opened = 0;
834         finfo.ino = iunique(dir->i_sb, 2);
835         finfo.volume = finfo.i.volNumber;
836         error = -EACCES;
837         inode = ncp_iget(dir->i_sb, &finfo);
838
839         if (inode) {
840                 ncp_new_dentry(dentry);
841 add_entry:
842                 dentry->d_op = &ncp_dentry_operations;
843                 d_add(dentry, inode);
844                 error = 0;
845         }
846
847 finished:
848         PPRINTK("ncp_lookup: result=%d\n", error);
849         unlock_kernel();
850         return ERR_PTR(error);
851 }
852
853 /*
854  * This code is common to create, mkdir, and mknod.
855  */
856 static int ncp_instantiate(struct inode *dir, struct dentry *dentry,
857                         struct ncp_entry_info *finfo)
858 {
859         struct inode *inode;
860         int error = -EINVAL;
861
862         finfo->ino = iunique(dir->i_sb, 2);
863         inode = ncp_iget(dir->i_sb, finfo);
864         if (!inode)
865                 goto out_close;
866         d_instantiate(dentry,inode);
867         error = 0;
868 out:
869         return error;
870
871 out_close:
872         PPRINTK("ncp_instantiate: %s/%s failed, closing file\n",
873                 dentry->d_parent->d_name.name, dentry->d_name.name);
874         ncp_close_file(NCP_SERVER(dir), finfo->file_handle);
875         goto out;
876 }
877
878 int ncp_create_new(struct inode *dir, struct dentry *dentry, int mode,
879                    dev_t rdev, __le32 attributes)
880 {
881         struct ncp_server *server = NCP_SERVER(dir);
882         struct ncp_entry_info finfo;
883         int error, result, len;
884         int opmode;
885         __u8 __name[NCP_MAXPATHLEN + 1];
886         
887         PPRINTK("ncp_create_new: creating %s/%s, mode=%x\n",
888                 dentry->d_parent->d_name.name, dentry->d_name.name, mode);
889
890         error = -EIO;
891         lock_kernel();
892         if (!ncp_conn_valid(server))
893                 goto out;
894
895         ncp_age_dentry(server, dentry);
896         len = sizeof(__name);
897         error = ncp_io2vol(server, __name, &len, dentry->d_name.name,
898                            dentry->d_name.len, !ncp_preserve_case(dir));
899         if (error)
900                 goto out;
901
902         error = -EACCES;
903         
904         if (S_ISREG(mode) && 
905             (server->m.flags & NCP_MOUNT_EXTRAS) && 
906             (mode & S_IXUGO))
907                 attributes |= aSYSTEM | aSHARED;
908         
909         result = ncp_open_create_file_or_subdir(server, dir, __name,
910                                 OC_MODE_CREATE | OC_MODE_OPEN | OC_MODE_REPLACE,
911                                 attributes, AR_READ | AR_WRITE, &finfo);
912         opmode = O_RDWR;
913         if (result) {
914                 result = ncp_open_create_file_or_subdir(server, dir, __name,
915                                 OC_MODE_CREATE | OC_MODE_OPEN | OC_MODE_REPLACE,
916                                 attributes, AR_WRITE, &finfo);
917                 if (result) {
918                         if (result == 0x87)
919                                 error = -ENAMETOOLONG;
920                         DPRINTK("ncp_create: %s/%s failed\n",
921                                 dentry->d_parent->d_name.name, dentry->d_name.name);
922                         goto out;
923                 }
924                 opmode = O_WRONLY;
925         }
926         finfo.access = opmode;
927         if (ncp_is_nfs_extras(server, finfo.volume)) {
928                 finfo.i.nfs.mode = mode;
929                 finfo.i.nfs.rdev = new_encode_dev(rdev);
930                 if (ncp_modify_nfs_info(server, finfo.volume,
931                                         finfo.i.dirEntNum,
932                                         mode, new_encode_dev(rdev)) != 0)
933                         goto out;
934         }
935
936         error = ncp_instantiate(dir, dentry, &finfo);
937 out:
938         unlock_kernel();
939         return error;
940 }
941
942 static int ncp_create(struct inode *dir, struct dentry *dentry, int mode,
943                 struct nameidata *nd)
944 {
945         return ncp_create_new(dir, dentry, mode, 0, 0);
946 }
947
948 static int ncp_mkdir(struct inode *dir, struct dentry *dentry, int mode)
949 {
950         struct ncp_entry_info finfo;
951         struct ncp_server *server = NCP_SERVER(dir);
952         int error, len;
953         __u8 __name[NCP_MAXPATHLEN + 1];
954
955         DPRINTK("ncp_mkdir: making %s/%s\n",
956                 dentry->d_parent->d_name.name, dentry->d_name.name);
957
958         error = -EIO;
959         lock_kernel();
960         if (!ncp_conn_valid(server))
961                 goto out;
962
963         ncp_age_dentry(server, dentry);
964         len = sizeof(__name);
965         error = ncp_io2vol(server, __name, &len, dentry->d_name.name,
966                            dentry->d_name.len, !ncp_preserve_case(dir));
967         if (error)
968                 goto out;
969
970         error = -EACCES;
971         if (ncp_open_create_file_or_subdir(server, dir, __name,
972                                            OC_MODE_CREATE, aDIR,
973                                            cpu_to_le16(0xffff),
974                                            &finfo) == 0)
975         {
976                 if (ncp_is_nfs_extras(server, finfo.volume)) {
977                         mode |= S_IFDIR;
978                         finfo.i.nfs.mode = mode;
979                         if (ncp_modify_nfs_info(server,
980                                                 finfo.volume,
981                                                 finfo.i.dirEntNum,
982                                                 mode, 0) != 0)
983                                 goto out;
984                 }
985                 error = ncp_instantiate(dir, dentry, &finfo);
986         }
987 out:
988         unlock_kernel();
989         return error;
990 }
991
992 static int ncp_rmdir(struct inode *dir, struct dentry *dentry)
993 {
994         struct ncp_server *server = NCP_SERVER(dir);
995         int error, result, len;
996         __u8 __name[NCP_MAXPATHLEN + 1];
997
998         DPRINTK("ncp_rmdir: removing %s/%s\n",
999                 dentry->d_parent->d_name.name, dentry->d_name.name);
1000
1001         error = -EIO;
1002         lock_kernel();
1003         if (!ncp_conn_valid(server))
1004                 goto out;
1005
1006         error = -EBUSY;
1007         if (!d_unhashed(dentry))
1008                 goto out;
1009
1010         len = sizeof(__name);
1011         error = ncp_io2vol(server, __name, &len, dentry->d_name.name,
1012                            dentry->d_name.len, !ncp_preserve_case(dir));
1013         if (error)
1014                 goto out;
1015
1016         result = ncp_del_file_or_subdir(server, dir, __name);
1017         switch (result) {
1018                 case 0x00:
1019                         error = 0;
1020                         break;
1021                 case 0x85:      /* unauthorized to delete file */
1022                 case 0x8A:      /* unauthorized to delete file */
1023                         error = -EACCES;
1024                         break;
1025                 case 0x8F:
1026                 case 0x90:      /* read only */
1027                         error = -EPERM;
1028                         break;
1029                 case 0x9F:      /* in use by another client */
1030                         error = -EBUSY;
1031                         break;
1032                 case 0xA0:      /* directory not empty */
1033                         error = -ENOTEMPTY;
1034                         break;
1035                 case 0xFF:      /* someone deleted file */
1036                         error = -ENOENT;
1037                         break;
1038                 default:
1039                         error = -EACCES;
1040                         break;
1041         }
1042 out:
1043         unlock_kernel();
1044         return error;
1045 }
1046
1047 static int ncp_unlink(struct inode *dir, struct dentry *dentry)
1048 {
1049         struct inode *inode = dentry->d_inode;
1050         struct ncp_server *server;
1051         int error;
1052
1053         lock_kernel();
1054         server = NCP_SERVER(dir);
1055         DPRINTK("ncp_unlink: unlinking %s/%s\n",
1056                 dentry->d_parent->d_name.name, dentry->d_name.name);
1057         
1058         error = -EIO;
1059         if (!ncp_conn_valid(server))
1060                 goto out;
1061
1062         /*
1063          * Check whether to close the file ...
1064          */
1065         if (inode) {
1066                 PPRINTK("ncp_unlink: closing file\n");
1067                 ncp_make_closed(inode);
1068         }
1069
1070         error = ncp_del_file_or_subdir2(server, dentry);
1071 #ifdef CONFIG_NCPFS_STRONG
1072         /* 9C is Invalid path.. It should be 8F, 90 - read only, but
1073            it is not :-( */
1074         if ((error == 0x9C || error == 0x90) && server->m.flags & NCP_MOUNT_STRONG) { /* R/O */
1075                 error = ncp_force_unlink(dir, dentry);
1076         }
1077 #endif
1078         switch (error) {
1079                 case 0x00:
1080                         DPRINTK("ncp: removed %s/%s\n",
1081                                 dentry->d_parent->d_name.name, dentry->d_name.name);
1082                         break;
1083                 case 0x85:
1084                 case 0x8A:
1085                         error = -EACCES;
1086                         break;
1087                 case 0x8D:      /* some files in use */
1088                 case 0x8E:      /* all files in use */
1089                         error = -EBUSY;
1090                         break;
1091                 case 0x8F:      /* some read only */
1092                 case 0x90:      /* all read only */
1093                 case 0x9C:      /* !!! returned when in-use or read-only by NW4 */
1094                         error = -EPERM;
1095                         break;
1096                 case 0xFF:
1097                         error = -ENOENT;
1098                         break;
1099                 default:
1100                         error = -EACCES;
1101                         break;
1102         }
1103                 
1104 out:
1105         unlock_kernel();
1106         return error;
1107 }
1108
1109 static int ncp_rename(struct inode *old_dir, struct dentry *old_dentry,
1110                       struct inode *new_dir, struct dentry *new_dentry)
1111 {
1112         struct ncp_server *server = NCP_SERVER(old_dir);
1113         int error;
1114         int old_len, new_len;
1115         __u8 __old_name[NCP_MAXPATHLEN + 1], __new_name[NCP_MAXPATHLEN + 1];
1116
1117         DPRINTK("ncp_rename: %s/%s to %s/%s\n",
1118                 old_dentry->d_parent->d_name.name, old_dentry->d_name.name,
1119                 new_dentry->d_parent->d_name.name, new_dentry->d_name.name);
1120
1121         error = -EIO;
1122         lock_kernel();
1123         if (!ncp_conn_valid(server))
1124                 goto out;
1125
1126         ncp_age_dentry(server, old_dentry);
1127         ncp_age_dentry(server, new_dentry);
1128
1129         old_len = sizeof(__old_name);
1130         error = ncp_io2vol(server, __old_name, &old_len,
1131                            old_dentry->d_name.name, old_dentry->d_name.len,
1132                            !ncp_preserve_case(old_dir));
1133         if (error)
1134                 goto out;
1135
1136         new_len = sizeof(__new_name);
1137         error = ncp_io2vol(server, __new_name, &new_len,
1138                            new_dentry->d_name.name, new_dentry->d_name.len,
1139                            !ncp_preserve_case(new_dir));
1140         if (error)
1141                 goto out;
1142
1143         error = ncp_ren_or_mov_file_or_subdir(server, old_dir, __old_name,
1144                                                       new_dir, __new_name);
1145 #ifdef CONFIG_NCPFS_STRONG
1146         if ((error == 0x90 || error == 0x8B || error == -EACCES) &&
1147                         server->m.flags & NCP_MOUNT_STRONG) {   /* RO */
1148                 error = ncp_force_rename(old_dir, old_dentry, __old_name,
1149                                          new_dir, new_dentry, __new_name);
1150         }
1151 #endif
1152         switch (error) {
1153                 case 0x00:
1154                         DPRINTK("ncp renamed %s -> %s.\n",
1155                                 old_dentry->d_name.name,new_dentry->d_name.name);
1156                         break;
1157                 case 0x9E:
1158                         error = -ENAMETOOLONG;
1159                         break;
1160                 case 0xFF:
1161                         error = -ENOENT;
1162                         break;
1163                 default:
1164                         error = -EACCES;
1165                         break;
1166         }
1167 out:
1168         unlock_kernel();
1169         return error;
1170 }
1171
1172 static int ncp_mknod(struct inode * dir, struct dentry *dentry,
1173                      int mode, dev_t rdev)
1174 {
1175         if (!new_valid_dev(rdev))
1176                 return -EINVAL;
1177         if (ncp_is_nfs_extras(NCP_SERVER(dir), NCP_FINFO(dir)->volNumber)) {
1178                 DPRINTK(KERN_DEBUG "ncp_mknod: mode = 0%o\n", mode);
1179                 return ncp_create_new(dir, dentry, mode, rdev, 0);
1180         }
1181         return -EPERM; /* Strange, but true */
1182 }
1183
1184 /* The following routines are taken directly from msdos-fs */
1185
1186 /* Linear day numbers of the respective 1sts in non-leap years. */
1187
1188 static int day_n[] =
1189 {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 0, 0, 0, 0};
1190 /* Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec */
1191
1192
1193 extern struct timezone sys_tz;
1194
1195 static int utc2local(int time)
1196 {
1197         return time - sys_tz.tz_minuteswest * 60;
1198 }
1199
1200 static int local2utc(int time)
1201 {
1202         return time + sys_tz.tz_minuteswest * 60;
1203 }
1204
1205 /* Convert a MS-DOS time/date pair to a UNIX date (seconds since 1 1 70). */
1206 int
1207 ncp_date_dos2unix(__le16 t, __le16 d)
1208 {
1209         unsigned short time = le16_to_cpu(t), date = le16_to_cpu(d);
1210         int month, year, secs;
1211
1212         /* first subtract and mask after that... Otherwise, if
1213            date == 0, bad things happen */
1214         month = ((date >> 5) - 1) & 15;
1215         year = date >> 9;
1216         secs = (time & 31) * 2 + 60 * ((time >> 5) & 63) + (time >> 11) * 3600 +
1217                 86400 * ((date & 31) - 1 + day_n[month] + (year / 4) + 
1218                 year * 365 - ((year & 3) == 0 && month < 2 ? 1 : 0) + 3653);
1219         /* days since 1.1.70 plus 80's leap day */
1220         return local2utc(secs);
1221 }
1222
1223
1224 /* Convert linear UNIX date to a MS-DOS time/date pair. */
1225 void
1226 ncp_date_unix2dos(int unix_date, __le16 *time, __le16 *date)
1227 {
1228         int day, year, nl_day, month;
1229
1230         unix_date = utc2local(unix_date);
1231         *time = cpu_to_le16(
1232                 (unix_date % 60) / 2 + (((unix_date / 60) % 60) << 5) +
1233                 (((unix_date / 3600) % 24) << 11));
1234         day = unix_date / 86400 - 3652;
1235         year = day / 365;
1236         if ((year + 3) / 4 + 365 * year > day)
1237                 year--;
1238         day -= (year + 3) / 4 + 365 * year;
1239         if (day == 59 && !(year & 3)) {
1240                 nl_day = day;
1241                 month = 2;
1242         } else {
1243                 nl_day = (year & 3) || day <= 59 ? day : day - 1;
1244                 for (month = 1; month < 12; month++)
1245                         if (day_n[month] > nl_day)
1246                                 break;
1247         }
1248         *date = cpu_to_le16(nl_day - day_n[month - 1] + 1 + (month << 5) + (year << 9));
1249 }