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 }