[CIFS] Support for setting up SMB sessions to legacy lanman servers
[linux-2.6.git] / fs / cifs / readdir.c
1 /*
2  *   fs/cifs/readdir.c
3  *
4  *   Directory search handling
5  * 
6  *   Copyright (C) International Business Machines  Corp., 2004, 2005
7  *   Author(s): Steve French (sfrench@us.ibm.com)
8  *
9  *   This library is free software; you can redistribute it and/or modify
10  *   it under the terms of the GNU Lesser General Public License as published
11  *   by the Free Software Foundation; either version 2.1 of the License, or
12  *   (at your option) any later version.
13  *
14  *   This library is distributed in the hope that it will be useful,
15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
17  *   the GNU Lesser General Public License for more details.
18  *
19  *   You should have received a copy of the GNU Lesser General Public License
20  *   along with this library; if not, write to the Free Software
21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22  */
23 #include <linux/fs.h>
24 #include <linux/stat.h>
25 #include <linux/smp_lock.h>
26 #include "cifspdu.h"
27 #include "cifsglob.h"
28 #include "cifsproto.h"
29 #include "cifs_unicode.h"
30 #include "cifs_debug.h"
31 #include "cifs_fs_sb.h"
32 #include "cifsfs.h"
33
34 #ifdef CONFIG_CIFS_DEBUG2
35 static void dump_cifs_file_struct(struct file *file, char *label)
36 {
37         struct cifsFileInfo * cf;
38
39         if(file) {
40                 cf = file->private_data;
41                 if(cf == NULL) {
42                         cFYI(1,("empty cifs private file data"));
43                         return;
44                 }
45                 if(cf->invalidHandle) {
46                         cFYI(1,("invalid handle"));
47                 }
48                 if(cf->srch_inf.endOfSearch) {
49                         cFYI(1,("end of search"));
50                 }
51                 if(cf->srch_inf.emptyDir) {
52                         cFYI(1,("empty dir"));
53                 }
54                 
55         }
56 }
57 #endif /* DEBUG2 */
58
59 /* Returns one if new inode created (which therefore needs to be hashed) */
60 /* Might check in the future if inode number changed so we can rehash inode */
61 static int construct_dentry(struct qstr *qstring, struct file *file,
62         struct inode **ptmp_inode, struct dentry **pnew_dentry)
63 {
64         struct dentry *tmp_dentry;
65         struct cifs_sb_info *cifs_sb;
66         struct cifsTconInfo *pTcon;
67         int rc = 0;
68
69         cFYI(1, ("For %s", qstring->name));
70         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
71         pTcon = cifs_sb->tcon;
72
73         qstring->hash = full_name_hash(qstring->name, qstring->len);
74         tmp_dentry = d_lookup(file->f_dentry, qstring);
75         if (tmp_dentry) {
76                 cFYI(0, ("existing dentry with inode 0x%p", tmp_dentry->d_inode));
77                 *ptmp_inode = tmp_dentry->d_inode;
78 /* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
79                 if(*ptmp_inode == NULL) {
80                         *ptmp_inode = new_inode(file->f_dentry->d_sb);
81                         if(*ptmp_inode == NULL)
82                                 return rc;
83                         rc = 1;
84                         d_instantiate(tmp_dentry, *ptmp_inode);
85                 }
86         } else {
87                 tmp_dentry = d_alloc(file->f_dentry, qstring);
88                 if(tmp_dentry == NULL) {
89                         cERROR(1,("Failed allocating dentry"));
90                         *ptmp_inode = NULL;
91                         return rc;
92                 }
93
94                 *ptmp_inode = new_inode(file->f_dentry->d_sb);
95                 if (pTcon->nocase)
96                         tmp_dentry->d_op = &cifs_ci_dentry_ops;
97                 else
98                         tmp_dentry->d_op = &cifs_dentry_ops;
99                 if(*ptmp_inode == NULL)
100                         return rc;
101                 rc = 1;
102                 d_instantiate(tmp_dentry, *ptmp_inode);
103                 d_rehash(tmp_dentry);
104         }
105
106         tmp_dentry->d_time = jiffies;
107         *pnew_dentry = tmp_dentry;
108         return rc;
109 }
110
111 static void fill_in_inode(struct inode *tmp_inode,
112         FILE_DIRECTORY_INFO *pfindData, int *pobject_type, int isNewInode)
113 {
114         loff_t local_size;
115         struct timespec local_mtime;
116
117         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
118         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
119         __u32 attr = le32_to_cpu(pfindData->ExtFileAttributes);
120         __u64 allocation_size = le64_to_cpu(pfindData->AllocationSize);
121         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
122
123         cifsInfo->cifsAttrs = attr;
124         cifsInfo->time = jiffies;
125
126         /* save mtime and size */
127         local_mtime = tmp_inode->i_mtime;
128         local_size  = tmp_inode->i_size;
129
130         /* Linux can not store file creation time unfortunately so ignore it */
131         tmp_inode->i_atime =
132             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
133         tmp_inode->i_mtime =
134             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
135         tmp_inode->i_ctime =
136             cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
137         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
138         /* 2767 perms - indicate mandatory locking */
139                 /* BB fill in uid and gid here? with help from winbind? 
140                    or retrieve from NTFS stream extended attribute */
141         if (atomic_read(&cifsInfo->inUse) == 0) {
142                 tmp_inode->i_uid = cifs_sb->mnt_uid;
143                 tmp_inode->i_gid = cifs_sb->mnt_gid;
144                 /* set default mode. will override for dirs below */
145                 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
146         } else {
147                 /* mask off the type bits since it gets set
148                 below and we do not want to get two type
149                 bits set */
150                 tmp_inode->i_mode &= ~S_IFMT;
151         }
152
153         if (attr & ATTR_DIRECTORY) {
154                 *pobject_type = DT_DIR;
155                 /* override default perms since we do not lock dirs */
156                 if(atomic_read(&cifsInfo->inUse) == 0) {
157                         tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
158                 }
159                 tmp_inode->i_mode |= S_IFDIR;
160         } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) && 
161                    (attr & ATTR_SYSTEM)) {
162                 if (end_of_file == 0)  {
163                         *pobject_type = DT_FIFO;
164                         tmp_inode->i_mode |= S_IFIFO;
165                 } else {
166                         /* rather than get the type here, we mark the
167                         inode as needing revalidate and get the real type
168                         (blk vs chr vs. symlink) later ie in lookup */
169                         *pobject_type = DT_REG;
170                         tmp_inode->i_mode |= S_IFREG; 
171                         cifsInfo->time = 0;     
172                 }
173 /* we no longer mark these because we could not follow them */
174 /*        } else if (attr & ATTR_REPARSE) {
175                 *pobject_type = DT_LNK;
176                 tmp_inode->i_mode |= S_IFLNK; */
177         } else {
178                 *pobject_type = DT_REG;
179                 tmp_inode->i_mode |= S_IFREG;
180                 if (attr & ATTR_READONLY)
181                         tmp_inode->i_mode &= ~(S_IWUGO);
182         } /* could add code here - to validate if device or weird share type? */
183
184         /* can not fill in nlink here as in qpathinfo version and Unx search */
185         if (atomic_read(&cifsInfo->inUse) == 0) {
186                 atomic_set(&cifsInfo->inUse, 1);
187         }
188
189         if (is_size_safe_to_change(cifsInfo)) {
190                 /* can not safely change the file size here if the 
191                 client is writing to it due to potential races */
192                 i_size_write(tmp_inode, end_of_file);
193
194         /* 512 bytes (2**9) is the fake blocksize that must be used */
195         /* for this calculation, even though the reported blocksize is larger */
196                 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
197         }
198
199         if (allocation_size < end_of_file)
200                 cFYI(1, ("May be sparse file, allocation less than file size"));
201         cFYI(1, ("File Size %ld and blocks %llu and blocksize %ld",
202                 (unsigned long)tmp_inode->i_size,
203                 (unsigned long long)tmp_inode->i_blocks,
204                 tmp_inode->i_blksize));
205         if (S_ISREG(tmp_inode->i_mode)) {
206                 cFYI(1, ("File inode"));
207                 tmp_inode->i_op = &cifs_file_inode_ops;
208                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
209                         if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
210                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
211                         else
212                                 tmp_inode->i_fop = &cifs_file_direct_ops;
213                 
214                 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
215                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
216                 else
217                         tmp_inode->i_fop = &cifs_file_ops;
218
219                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
220                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
221                    (cifs_sb->tcon->ses->server->maxBuf <
222                         4096 + MAX_CIFS_HDR_SIZE))
223                         tmp_inode->i_data.a_ops->readpages = NULL;
224                 if(isNewInode)
225                         return; /* No sense invalidating pages for new inode
226                                    since have not started caching readahead file
227                                    data yet */
228
229                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
230                         (local_size == tmp_inode->i_size)) {
231                         cFYI(1, ("inode exists but unchanged"));
232                 } else {
233                         /* file may have changed on server */
234                         cFYI(1, ("invalidate inode, readdir detected change"));
235                         invalidate_remote_inode(tmp_inode);
236                 }
237         } else if (S_ISDIR(tmp_inode->i_mode)) {
238                 cFYI(1, ("Directory inode"));
239                 tmp_inode->i_op = &cifs_dir_inode_ops;
240                 tmp_inode->i_fop = &cifs_dir_ops;
241         } else if (S_ISLNK(tmp_inode->i_mode)) {
242                 cFYI(1, ("Symbolic Link inode"));
243                 tmp_inode->i_op = &cifs_symlink_inode_ops;
244         } else {
245                 cFYI(1, ("Init special inode"));
246                 init_special_inode(tmp_inode, tmp_inode->i_mode,
247                                    tmp_inode->i_rdev);
248         }
249 }
250
251 static void unix_fill_in_inode(struct inode *tmp_inode,
252         FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
253 {
254         loff_t local_size;
255         struct timespec local_mtime;
256
257         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
258         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
259
260         __u32 type = le32_to_cpu(pfindData->Type);
261         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
262         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
263         cifsInfo->time = jiffies;
264         atomic_inc(&cifsInfo->inUse);
265
266         /* save mtime and size */
267         local_mtime = tmp_inode->i_mtime;
268         local_size  = tmp_inode->i_size;
269
270         tmp_inode->i_atime =
271             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
272         tmp_inode->i_mtime =
273             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
274         tmp_inode->i_ctime =
275             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
276
277         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
278         /* since we set the inode type below we need to mask off type
279            to avoid strange results if bits above were corrupt */
280         tmp_inode->i_mode &= ~S_IFMT;
281         if (type == UNIX_FILE) {
282                 *pobject_type = DT_REG;
283                 tmp_inode->i_mode |= S_IFREG;
284         } else if (type == UNIX_SYMLINK) {
285                 *pobject_type = DT_LNK;
286                 tmp_inode->i_mode |= S_IFLNK;
287         } else if (type == UNIX_DIR) {
288                 *pobject_type = DT_DIR;
289                 tmp_inode->i_mode |= S_IFDIR;
290         } else if (type == UNIX_CHARDEV) {
291                 *pobject_type = DT_CHR;
292                 tmp_inode->i_mode |= S_IFCHR;
293                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
294                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
295         } else if (type == UNIX_BLOCKDEV) {
296                 *pobject_type = DT_BLK;
297                 tmp_inode->i_mode |= S_IFBLK;
298                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
299                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
300         } else if (type == UNIX_FIFO) {
301                 *pobject_type = DT_FIFO;
302                 tmp_inode->i_mode |= S_IFIFO;
303         } else if (type == UNIX_SOCKET) {
304                 *pobject_type = DT_SOCK;
305                 tmp_inode->i_mode |= S_IFSOCK;
306         } else {
307                 /* safest to just call it a file */
308                 *pobject_type = DT_REG;
309                 tmp_inode->i_mode |= S_IFREG;
310                 cFYI(1,("unknown inode type %d",type)); 
311         }
312
313         tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
314         tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
315         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
316
317         if (is_size_safe_to_change(cifsInfo)) {
318                 /* can not safely change the file size here if the 
319                 client is writing to it due to potential races */
320                 i_size_write(tmp_inode,end_of_file);
321
322         /* 512 bytes (2**9) is the fake blocksize that must be used */
323         /* for this calculation, not the real blocksize */
324                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
325         }
326
327         if (S_ISREG(tmp_inode->i_mode)) {
328                 cFYI(1, ("File inode"));
329                 tmp_inode->i_op = &cifs_file_inode_ops;
330
331                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
332                         if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
333                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
334                         else
335                                 tmp_inode->i_fop = &cifs_file_direct_ops;
336                 
337                 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
338                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
339                 else
340                         tmp_inode->i_fop = &cifs_file_ops;
341
342                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
343                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
344                    (cifs_sb->tcon->ses->server->maxBuf < 
345                         4096 + MAX_CIFS_HDR_SIZE))
346                         tmp_inode->i_data.a_ops->readpages = NULL;
347
348                 if(isNewInode)
349                         return; /* No sense invalidating pages for new inode since we
350                                            have not started caching readahead file data yet */
351
352                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
353                         (local_size == tmp_inode->i_size)) {
354                         cFYI(1, ("inode exists but unchanged"));
355                 } else {
356                         /* file may have changed on server */
357                         cFYI(1, ("invalidate inode, readdir detected change"));
358                         invalidate_remote_inode(tmp_inode);
359                 }
360         } else if (S_ISDIR(tmp_inode->i_mode)) {
361                 cFYI(1, ("Directory inode"));
362                 tmp_inode->i_op = &cifs_dir_inode_ops;
363                 tmp_inode->i_fop = &cifs_dir_ops;
364         } else if (S_ISLNK(tmp_inode->i_mode)) {
365                 cFYI(1, ("Symbolic Link inode"));
366                 tmp_inode->i_op = &cifs_symlink_inode_ops;
367 /* tmp_inode->i_fop = *//* do not need to set to anything */
368         } else {
369                 cFYI(1, ("Special inode")); 
370                 init_special_inode(tmp_inode, tmp_inode->i_mode,
371                                    tmp_inode->i_rdev);
372         }
373 }
374
375 static int initiate_cifs_search(const int xid, struct file *file)
376 {
377         int rc = 0;
378         char * full_path;
379         struct cifsFileInfo * cifsFile;
380         struct cifs_sb_info *cifs_sb;
381         struct cifsTconInfo *pTcon;
382
383         if(file->private_data == NULL) {
384                 file->private_data = 
385                         kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
386         }
387
388         if(file->private_data == NULL) {
389                 return -ENOMEM;
390         } else {
391                 memset(file->private_data,0,sizeof(struct cifsFileInfo));
392         }
393         cifsFile = file->private_data;
394         cifsFile->invalidHandle = TRUE;
395         cifsFile->srch_inf.endOfSearch = FALSE;
396
397         if(file->f_dentry == NULL)
398                 return -ENOENT;
399
400         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
401         if(cifs_sb == NULL)
402                 return -EINVAL;
403
404         pTcon = cifs_sb->tcon;
405         if(pTcon == NULL)
406                 return -EINVAL;
407
408         full_path = build_path_from_dentry(file->f_dentry);
409
410         if(full_path == NULL) {
411                 return -ENOMEM;
412         }
413
414         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
415
416 ffirst_retry:
417         /* test for Unix extensions */
418         if (pTcon->ses->capabilities & CAP_UNIX) {
419                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX; 
420         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
421                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
422         } else /* not srvinos - BB fixme add check for backlevel? */ {
423                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
424         }
425
426         rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
427                 &cifsFile->netfid, &cifsFile->srch_inf,
428                 cifs_sb->mnt_cifs_flags & 
429                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
430         if(rc == 0)
431                 cifsFile->invalidHandle = FALSE;
432         if((rc == -EOPNOTSUPP) && 
433                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
434                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
435                 goto ffirst_retry;
436         }
437         kfree(full_path);
438         return rc;
439 }
440
441 /* return length of unicode string in bytes */
442 static int cifs_unicode_bytelen(char *str)
443 {
444         int len;
445         __le16 * ustr = (__le16 *)str;
446
447         for(len=0;len <= PATH_MAX;len++) {
448                 if(ustr[len] == 0)
449                         return len << 1;
450         }
451         cFYI(1,("Unicode string longer than PATH_MAX found"));
452         return len << 1;
453 }
454
455 static char *nxt_dir_entry(char *old_entry, char *end_of_smb)
456 {
457         char * new_entry;
458         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
459
460         new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
461         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
462         /* validate that new_entry is not past end of SMB */
463         if(new_entry >= end_of_smb) {
464                 cERROR(1,
465                       ("search entry %p began after end of SMB %p old entry %p",
466                         new_entry, end_of_smb, old_entry)); 
467                 return NULL;
468         } else if (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb) {
469                 cERROR(1,("search entry %p extends after end of SMB %p",
470                         new_entry, end_of_smb));
471                 return NULL;
472         } else 
473                 return new_entry;
474
475 }
476
477 #define UNICODE_DOT cpu_to_le16(0x2e)
478
479 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
480 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
481 {
482         int rc = 0;
483         char * filename = NULL;
484         int len = 0; 
485
486         if(cfile->srch_inf.info_level == 0x202) {
487                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
488                 filename = &pFindData->FileName[0];
489                 if(cfile->srch_inf.unicode) {
490                         len = cifs_unicode_bytelen(filename);
491                 } else {
492                         /* BB should we make this strnlen of PATH_MAX? */
493                         len = strnlen(filename, 5);
494                 }
495         } else if(cfile->srch_inf.info_level == 0x101) {
496                 FILE_DIRECTORY_INFO * pFindData = 
497                         (FILE_DIRECTORY_INFO *)current_entry;
498                 filename = &pFindData->FileName[0];
499                 len = le32_to_cpu(pFindData->FileNameLength);
500         } else if(cfile->srch_inf.info_level == 0x102) {
501                 FILE_FULL_DIRECTORY_INFO * pFindData = 
502                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
503                 filename = &pFindData->FileName[0];
504                 len = le32_to_cpu(pFindData->FileNameLength);
505         } else if(cfile->srch_inf.info_level == 0x105) {
506                 SEARCH_ID_FULL_DIR_INFO * pFindData = 
507                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
508                 filename = &pFindData->FileName[0];
509                 len = le32_to_cpu(pFindData->FileNameLength);
510         } else if(cfile->srch_inf.info_level == 0x104) {
511                 FILE_BOTH_DIRECTORY_INFO * pFindData = 
512                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
513                 filename = &pFindData->FileName[0];
514                 len = le32_to_cpu(pFindData->FileNameLength);
515         } else {
516                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
517         }
518
519         if(filename) {
520                 if(cfile->srch_inf.unicode) {
521                         __le16 *ufilename = (__le16 *)filename;
522                         if(len == 2) {
523                                 /* check for . */
524                                 if(ufilename[0] == UNICODE_DOT)
525                                         rc = 1;
526                         } else if(len == 4) {
527                                 /* check for .. */
528                                 if((ufilename[0] == UNICODE_DOT)
529                                    &&(ufilename[1] == UNICODE_DOT))
530                                         rc = 2;
531                         }
532                 } else /* ASCII */ {
533                         if(len == 1) {
534                                 if(filename[0] == '.') 
535                                         rc = 1;
536                         } else if(len == 2) {
537                                 if((filename[0] == '.') && (filename[1] == '.')) 
538                                         rc = 2;
539                         }
540                 }
541         }
542
543         return rc;
544 }
545
546 /* Check if directory that we are searching has changed so we can decide
547    whether we can use the cached search results from the previous search */
548 static int is_dir_changed(struct file * file)
549 {
550         struct inode * inode;
551         struct cifsInodeInfo *cifsInfo;
552
553         if(file->f_dentry == NULL)
554                 return 0;
555
556         inode = file->f_dentry->d_inode;
557
558         if(inode == NULL)
559                 return 0;
560
561         cifsInfo = CIFS_I(inode);
562
563         if(cifsInfo->time == 0)
564                 return 1; /* directory was changed, perhaps due to unlink */
565         else
566                 return 0;
567
568 }
569
570 /* find the corresponding entry in the search */
571 /* Note that the SMB server returns search entries for . and .. which
572    complicates logic here if we choose to parse for them and we do not
573    assume that they are located in the findfirst return buffer.*/
574 /* We start counting in the buffer with entry 2 and increment for every
575    entry (do not increment for . or .. entry) */
576 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
577         struct file *file, char **ppCurrentEntry, int *num_to_ret) 
578 {
579         int rc = 0;
580         int pos_in_buf = 0;
581         loff_t first_entry_in_buffer;
582         loff_t index_to_find = file->f_pos;
583         struct cifsFileInfo * cifsFile = file->private_data;
584         /* check if index in the buffer */
585         
586         if((cifsFile == NULL) || (ppCurrentEntry == NULL) || 
587            (num_to_ret == NULL))
588                 return -ENOENT;
589         
590         *ppCurrentEntry = NULL;
591         first_entry_in_buffer = 
592                 cifsFile->srch_inf.index_of_last_entry - 
593                         cifsFile->srch_inf.entries_in_buffer;
594
595         /* if first entry in buf is zero then is first buffer
596         in search response data which means it is likely . and ..
597         will be in this buffer, although some servers do not return
598         . and .. for the root of a drive and for those we need
599         to start two entries earlier */
600
601 #ifdef CONFIG_CIFS_DEBUG2
602         dump_cifs_file_struct(file, "In fce ");
603 #endif
604         if(((index_to_find < cifsFile->srch_inf.index_of_last_entry) && 
605              is_dir_changed(file)) || 
606            (index_to_find < first_entry_in_buffer)) {
607                 /* close and restart search */
608                 cFYI(1,("search backing up - close and restart search"));
609                 cifsFile->invalidHandle = TRUE;
610                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
611                 kfree(cifsFile->search_resume_name);
612                 cifsFile->search_resume_name = NULL;
613                 if(cifsFile->srch_inf.ntwrk_buf_start) {
614                         cFYI(1,("freeing SMB ff cache buf on search rewind"));
615                         if(cifsFile->srch_inf.smallBuf)
616                                 cifs_small_buf_release(cifsFile->srch_inf.
617                                                 ntwrk_buf_start);
618                         else
619                                 cifs_buf_release(cifsFile->srch_inf.
620                                                 ntwrk_buf_start);
621                 }
622                 rc = initiate_cifs_search(xid,file);
623                 if(rc) {
624                         cFYI(1,("error %d reinitiating a search on rewind",rc));
625                         return rc;
626                 }
627         }
628
629         while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) && 
630               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
631                 cFYI(1,("calling findnext2"));
632                 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid, 
633                                   &cifsFile->srch_inf);
634                 if(rc)
635                         return -ENOENT;
636         }
637         if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
638                 /* we found the buffer that contains the entry */
639                 /* scan and find it */
640                 int i;
641                 char * current_entry;
642                 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + 
643                         smbCalcSize((struct smb_hdr *)
644                                 cifsFile->srch_inf.ntwrk_buf_start);
645
646                 current_entry = cifsFile->srch_inf.srch_entries_start;
647                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
648                                         - cifsFile->srch_inf.entries_in_buffer;
649                 pos_in_buf = index_to_find - first_entry_in_buffer;
650                 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf)); 
651                 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
652                         /* go entry by entry figuring out which is first */
653                         current_entry = nxt_dir_entry(current_entry,end_of_smb);
654                 }
655                 if((current_entry == NULL) && (i < pos_in_buf)) {
656                         /* BB fixme - check if we should flag this error */
657                         cERROR(1,("reached end of buf searching for pos in buf"
658                           " %d index to find %lld rc %d",
659                           pos_in_buf,index_to_find,rc));
660                 }
661                 rc = 0;
662                 *ppCurrentEntry = current_entry;
663         } else {
664                 cFYI(1,("index not in buffer - could not findnext into it"));
665                 return 0;
666         }
667
668         if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
669                 cFYI(1,("can not return entries pos_in_buf beyond last entry"));
670                 *num_to_ret = 0;
671         } else
672                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
673
674         return rc;
675 }
676
677 /* inode num, inode type and filename returned */
678 static int cifs_get_name_from_search_buf(struct qstr *pqst,
679         char *current_entry, __u16 level, unsigned int unicode,
680         struct cifs_sb_info * cifs_sb, ino_t *pinum)
681 {
682         int rc = 0;
683         unsigned int len = 0;
684         char * filename;
685         struct nls_table * nlt = cifs_sb->local_nls;
686
687         *pinum = 0;
688
689         if(level == SMB_FIND_FILE_UNIX) {
690                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
691
692                 filename = &pFindData->FileName[0];
693                 if(unicode) {
694                         len = cifs_unicode_bytelen(filename);
695                 } else {
696                         /* BB should we make this strnlen of PATH_MAX? */
697                         len = strnlen(filename, PATH_MAX);
698                 }
699
700                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
701                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
702                         *pinum = pFindData->UniqueId;
703         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
704                 FILE_DIRECTORY_INFO * pFindData = 
705                         (FILE_DIRECTORY_INFO *)current_entry;
706                 filename = &pFindData->FileName[0];
707                 len = le32_to_cpu(pFindData->FileNameLength);
708         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
709                 FILE_FULL_DIRECTORY_INFO * pFindData = 
710                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
711                 filename = &pFindData->FileName[0];
712                 len = le32_to_cpu(pFindData->FileNameLength);
713         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
714                 SEARCH_ID_FULL_DIR_INFO * pFindData = 
715                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
716                 filename = &pFindData->FileName[0];
717                 len = le32_to_cpu(pFindData->FileNameLength);
718                 *pinum = pFindData->UniqueId;
719         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
720                 FILE_BOTH_DIRECTORY_INFO * pFindData = 
721                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
722                 filename = &pFindData->FileName[0];
723                 len = le32_to_cpu(pFindData->FileNameLength);
724         } else {
725                 cFYI(1,("Unknown findfirst level %d",level));
726                 return -EINVAL;
727         }
728         if(unicode) {
729                 /* BB fixme - test with long names */
730                 /* Note converted filename can be longer than in unicode */
731                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
732                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
733                                         (__le16 *)filename, len/2, nlt);
734                 else
735                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
736                                         (__le16 *)filename,len/2,nlt);
737         } else {
738                 pqst->name = filename;
739                 pqst->len = len;
740         }
741         pqst->hash = full_name_hash(pqst->name,pqst->len);
742 /*      cFYI(1,("filldir on %s",pqst->name));  */
743         return rc;
744 }
745
746 static int cifs_filldir(char *pfindEntry, struct file *file,
747         filldir_t filldir, void *direntry, char *scratch_buf)
748 {
749         int rc = 0;
750         struct qstr qstring;
751         struct cifsFileInfo * pCifsF;
752         unsigned obj_type;
753         ino_t  inum;
754         struct cifs_sb_info * cifs_sb;
755         struct inode *tmp_inode;
756         struct dentry *tmp_dentry;
757
758         /* get filename and len into qstring */
759         /* get dentry */
760         /* decide whether to create and populate ionde */
761         if((direntry == NULL) || (file == NULL))
762                 return -EINVAL;
763
764         pCifsF = file->private_data;
765         
766         if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
767                 return -ENOENT;
768
769         if(file->f_dentry == NULL)
770                 return -ENOENT;
771
772         rc = cifs_entry_is_dot(pfindEntry,pCifsF);
773         /* skip . and .. since we added them first */
774         if(rc != 0) 
775                 return 0;
776
777         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
778
779         qstring.name = scratch_buf;
780         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
781                         pCifsF->srch_inf.info_level,
782                         pCifsF->srch_inf.unicode,cifs_sb,
783                         &inum /* returned */);
784
785         if(rc)
786                 return rc;
787
788         rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
789         if((tmp_inode == NULL) || (tmp_dentry == NULL))
790                 return -ENOMEM;
791
792         if(rc) {
793                 /* inode created, we need to hash it with right inode number */
794                 if(inum != 0) {
795                         /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
796                         tmp_inode->i_ino = inum;
797                 }
798                 insert_inode_hash(tmp_inode);
799         }
800
801         /* we pass in rc below, indicating whether it is a new inode,
802            so we can figure out whether to invalidate the inode cached
803            data if the file has changed */
804         if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
805                 unix_fill_in_inode(tmp_inode,
806                                    (FILE_UNIX_INFO *)pfindEntry,&obj_type, rc);
807         } else {
808                 fill_in_inode(tmp_inode,
809                               (FILE_DIRECTORY_INFO *)pfindEntry,&obj_type, rc);
810         }
811         
812         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
813                      tmp_inode->i_ino,obj_type);
814         if(rc) {
815                 cFYI(1,("filldir rc = %d",rc));
816         }
817
818         dput(tmp_dentry);
819         return rc;
820 }
821
822 static int cifs_save_resume_key(const char *current_entry,
823         struct cifsFileInfo *cifsFile)
824 {
825         int rc = 0;
826         unsigned int len = 0;
827         __u16 level;
828         char * filename;
829
830         if((cifsFile == NULL) || (current_entry == NULL))
831                 return -EINVAL;
832
833         level = cifsFile->srch_inf.info_level;
834
835         if(level == SMB_FIND_FILE_UNIX) {
836                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
837
838                 filename = &pFindData->FileName[0];
839                 if(cifsFile->srch_inf.unicode) {
840                         len = cifs_unicode_bytelen(filename);
841                 } else {
842                         /* BB should we make this strnlen of PATH_MAX? */
843                         len = strnlen(filename, PATH_MAX);
844                 }
845                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
846         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
847                 FILE_DIRECTORY_INFO * pFindData = 
848                         (FILE_DIRECTORY_INFO *)current_entry;
849                 filename = &pFindData->FileName[0];
850                 len = le32_to_cpu(pFindData->FileNameLength);
851                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
852         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
853                 FILE_FULL_DIRECTORY_INFO * pFindData = 
854                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
855                 filename = &pFindData->FileName[0];
856                 len = le32_to_cpu(pFindData->FileNameLength);
857                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
858         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
859                 SEARCH_ID_FULL_DIR_INFO * pFindData = 
860                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
861                 filename = &pFindData->FileName[0];
862                 len = le32_to_cpu(pFindData->FileNameLength);
863                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
864         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
865                 FILE_BOTH_DIRECTORY_INFO * pFindData = 
866                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
867                 filename = &pFindData->FileName[0];
868                 len = le32_to_cpu(pFindData->FileNameLength);
869                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
870         } else {
871                 cFYI(1,("Unknown findfirst level %d",level));
872                 return -EINVAL;
873         }
874         cifsFile->srch_inf.resume_name_len = len;
875         cifsFile->srch_inf.presume_name = filename;
876         return rc;
877 }
878
879 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
880 {
881         int rc = 0;
882         int xid,i;
883         struct cifs_sb_info *cifs_sb;
884         struct cifsTconInfo *pTcon;
885         struct cifsFileInfo *cifsFile = NULL;
886         char * current_entry;
887         int num_to_fill = 0;
888         char * tmp_buf = NULL;
889         char * end_of_smb;
890
891         xid = GetXid();
892
893         if(file->f_dentry == NULL) {
894                 FreeXid(xid);
895                 return -EIO;
896         }
897
898         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
899         pTcon = cifs_sb->tcon;
900         if(pTcon == NULL)
901                 return -EINVAL;
902
903         switch ((int) file->f_pos) {
904         case 0:
905                 if (filldir(direntry, ".", 1, file->f_pos,
906                      file->f_dentry->d_inode->i_ino, DT_DIR) < 0) {
907                         cERROR(1, ("Filldir for current dir failed"));
908                         rc = -ENOMEM;
909                         break;
910                 }
911                 file->f_pos++;
912         case 1:
913                 if (filldir(direntry, "..", 2, file->f_pos,
914                      file->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
915                         cERROR(1, ("Filldir for parent dir failed"));
916                         rc = -ENOMEM;
917                         break;
918                 }
919                 file->f_pos++;
920         default:
921                 /* 1) If search is active, 
922                         is in current search buffer? 
923                         if it before then restart search
924                         if after then keep searching till find it */
925
926                 if(file->private_data == NULL) {
927                         rc = initiate_cifs_search(xid,file);
928                         cFYI(1,("initiate cifs search rc %d",rc));
929                         if(rc) {
930                                 FreeXid(xid);
931                                 return rc;
932                         }
933                 }
934                 if(file->private_data == NULL) {
935                         rc = -EINVAL;
936                         FreeXid(xid);
937                         return rc;
938                 }
939                 cifsFile = file->private_data;
940                 if (cifsFile->srch_inf.endOfSearch) {
941                         if(cifsFile->srch_inf.emptyDir) {
942                                 cFYI(1, ("End of search, empty dir"));
943                                 rc = 0;
944                                 break;
945                         }
946                 } /* else {
947                         cifsFile->invalidHandle = TRUE;
948                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
949                 } 
950                 kfree(cifsFile->search_resume_name);
951                 cifsFile->search_resume_name = NULL; */
952
953                 rc = find_cifs_entry(xid,pTcon, file,
954                                 &current_entry,&num_to_fill);
955                 if(rc) {
956                         cFYI(1,("fce error %d",rc)); 
957                         goto rddir2_exit;
958                 } else if (current_entry != NULL) {
959                         cFYI(1,("entry %lld found",file->f_pos));
960                 } else {
961                         cFYI(1,("could not find entry"));
962                         goto rddir2_exit;
963                 }
964                 cFYI(1,("loop through %d times filling dir for net buf %p",
965                         num_to_fill,cifsFile->srch_inf.ntwrk_buf_start)); 
966                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
967                         smbCalcSize((struct smb_hdr *)
968                                     cifsFile->srch_inf.ntwrk_buf_start);
969                 /* To be safe - for UCS to UTF-8 with strings loaded
970                 with the rare long characters alloc more to account for
971                 such multibyte target UTF-8 characters. cifs_unicode.c,
972                 which actually does the conversion, has the same limit */
973                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
974                 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
975                         if(current_entry == NULL) {
976                                 /* evaluate whether this case is an error */
977                                 cERROR(1,("past end of SMB num to fill %d i %d",
978                                           num_to_fill, i));
979                                 break;
980                         }
981                         /* if buggy server returns . and .. late do
982                         we want to check for that here? */
983                         rc = cifs_filldir(current_entry, file, 
984                                         filldir, direntry,tmp_buf);
985                         file->f_pos++;
986                         if(file->f_pos == 
987                                 cifsFile->srch_inf.index_of_last_entry) {
988                                 cFYI(1,("last entry in buf at pos %lld %s",
989                                         file->f_pos,tmp_buf));
990                                 cifs_save_resume_key(current_entry,cifsFile);
991                                 break;
992                         } else 
993                                 current_entry = nxt_dir_entry(current_entry,
994                                                               end_of_smb);
995                 }
996                 kfree(tmp_buf);
997                 break;
998         } /* end switch */
999
1000 rddir2_exit:
1001         FreeXid(xid);
1002         return rc;
1003 }