[PATCH] cifs: add support for chattr/lsattr in new CIFS POSIX extensions
[linux-2.6] / fs / cifs / readdir.c
1 /*
2  *   fs/cifs/readdir.c
3  *
4  *   Directory search handling
5  * 
6  *   Copyright (C) International Business Machines  Corp., 2004
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 /* BB fixme - add debug wrappers around this function to disable it fixme BB */
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
58 /* Returns one if new inode created (which therefore needs to be hashed) */
59 /* Might check in the future if inode number changed so we can rehash inode */
60 static int construct_dentry(struct qstr *qstring, struct file *file,
61         struct inode **ptmp_inode, struct dentry **pnew_dentry)
62 {
63         struct dentry *tmp_dentry;
64         struct cifs_sb_info *cifs_sb;
65         struct cifsTconInfo *pTcon;
66         int rc = 0;
67
68         cFYI(1, ("For %s ", qstring->name));
69         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
70         pTcon = cifs_sb->tcon;
71
72         qstring->hash = full_name_hash(qstring->name, qstring->len);
73         tmp_dentry = d_lookup(file->f_dentry, qstring);
74         if (tmp_dentry) {
75                 cFYI(0, (" existing dentry with inode 0x%p", tmp_dentry->d_inode));
76                 *ptmp_inode = tmp_dentry->d_inode;
77 /* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
78                 if(*ptmp_inode == NULL) {
79                         *ptmp_inode = new_inode(file->f_dentry->d_sb);
80                         if(*ptmp_inode == NULL)
81                                 return rc;
82                         rc = 1;
83                         d_instantiate(tmp_dentry, *ptmp_inode);
84                 }
85         } else {
86                 tmp_dentry = d_alloc(file->f_dentry, qstring);
87                 if(tmp_dentry == NULL) {
88                         cERROR(1,("Failed allocating dentry"));
89                         *ptmp_inode = NULL;
90                         return rc;
91                 }
92
93                 *ptmp_inode = new_inode(file->f_dentry->d_sb);
94                 tmp_dentry->d_op = &cifs_dentry_ops;
95                 if(*ptmp_inode == NULL)
96                         return rc;
97                 rc = 1;
98                 d_instantiate(tmp_dentry, *ptmp_inode);
99                 d_rehash(tmp_dentry);
100         }
101
102         tmp_dentry->d_time = jiffies;
103         *pnew_dentry = tmp_dentry;
104         return rc;
105 }
106
107 static void fill_in_inode(struct inode *tmp_inode,
108         FILE_DIRECTORY_INFO *pfindData, int *pobject_type)
109 {
110         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
111         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
112         __u32 attr = le32_to_cpu(pfindData->ExtFileAttributes);
113         __u64 allocation_size = le64_to_cpu(pfindData->AllocationSize);
114         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
115
116         cifsInfo->cifsAttrs = attr;
117         cifsInfo->time = jiffies;
118
119         /* Linux can not store file creation time unfortunately so ignore it */
120         tmp_inode->i_atime =
121             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
122         tmp_inode->i_mtime =
123             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
124         tmp_inode->i_ctime =
125             cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
126         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
127         /* 2767 perms - indicate mandatory locking */
128                 /* BB fill in uid and gid here? with help from winbind? 
129                    or retrieve from NTFS stream extended attribute */
130         if (atomic_read(&cifsInfo->inUse) == 0) {
131                 tmp_inode->i_uid = cifs_sb->mnt_uid;
132                 tmp_inode->i_gid = cifs_sb->mnt_gid;
133                 /* set default mode. will override for dirs below */
134                 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
135         }
136
137         cFYI(0,("CIFS FFIRST: Attributes came in as 0x%x",attr));
138         if (attr & ATTR_DIRECTORY) {
139                 *pobject_type = DT_DIR;
140                 /* override default perms since we do not lock dirs */
141                 if(atomic_read(&cifsInfo->inUse) == 0) {
142                         tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
143                 }
144                 tmp_inode->i_mode |= S_IFDIR;
145 /* we no longer mark these because we could not follow them */
146 /*        } else if (attr & ATTR_REPARSE) {
147                 *pobject_type = DT_LNK;
148                 tmp_inode->i_mode |= S_IFLNK; */
149         } else {
150                 *pobject_type = DT_REG;
151                 tmp_inode->i_mode |= S_IFREG;
152                 if (attr & ATTR_READONLY)
153                         tmp_inode->i_mode &= ~(S_IWUGO);
154         } /* could add code here - to validate if device or weird share type? */
155
156         /* can not fill in nlink here as in qpathinfo version and Unx search */
157         if (atomic_read(&cifsInfo->inUse) == 0) {
158                 atomic_set(&cifsInfo->inUse, 1);
159         }
160
161         if (is_size_safe_to_change(cifsInfo)) {
162                 /* can not safely change the file size here if the 
163                 client is writing to it due to potential races */
164                 i_size_write(tmp_inode, end_of_file);
165
166         /* 512 bytes (2**9) is the fake blocksize that must be used */
167         /* for this calculation, even though the reported blocksize is larger */
168                 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
169         }
170
171         if (allocation_size < end_of_file)
172                 cFYI(1, ("May be sparse file, allocation less than file size"));
173         cFYI(1,
174              ("File Size %ld and blocks %ld and blocksize %ld",
175               (unsigned long)tmp_inode->i_size, tmp_inode->i_blocks,
176               tmp_inode->i_blksize));
177         if (S_ISREG(tmp_inode->i_mode)) {
178                 cFYI(1, (" File inode "));
179                 tmp_inode->i_op = &cifs_file_inode_ops;
180                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
181                         tmp_inode->i_fop = &cifs_file_direct_ops;
182                 else
183                         tmp_inode->i_fop = &cifs_file_ops;
184                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
185         } else if (S_ISDIR(tmp_inode->i_mode)) {
186                 cFYI(1, (" Directory inode"));
187                 tmp_inode->i_op = &cifs_dir_inode_ops;
188                 tmp_inode->i_fop = &cifs_dir_ops;
189         } else if (S_ISLNK(tmp_inode->i_mode)) {
190                 cFYI(1, (" Symbolic Link inode "));
191                 tmp_inode->i_op = &cifs_symlink_inode_ops;
192         } else {
193                 cFYI(1, (" Init special inode "));
194                 init_special_inode(tmp_inode, tmp_inode->i_mode,
195                                    tmp_inode->i_rdev);
196         }
197 }
198
199 static void unix_fill_in_inode(struct inode *tmp_inode,
200         FILE_UNIX_INFO *pfindData, int *pobject_type)
201 {
202         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
203         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
204
205         __u32 type = le32_to_cpu(pfindData->Type);
206         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
207         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
208         cifsInfo->time = jiffies;
209         atomic_inc(&cifsInfo->inUse);
210
211         tmp_inode->i_atime =
212             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
213         tmp_inode->i_mtime =
214             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
215         tmp_inode->i_ctime =
216             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
217
218         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
219         if (type == UNIX_FILE) {
220                 *pobject_type = DT_REG;
221                 tmp_inode->i_mode |= S_IFREG;
222         } else if (type == UNIX_SYMLINK) {
223                 *pobject_type = DT_LNK;
224                 tmp_inode->i_mode |= S_IFLNK;
225         } else if (type == UNIX_DIR) {
226                 *pobject_type = DT_DIR;
227                 tmp_inode->i_mode |= S_IFDIR;
228         } else if (type == UNIX_CHARDEV) {
229                 *pobject_type = DT_CHR;
230                 tmp_inode->i_mode |= S_IFCHR;
231                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
232                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
233         } else if (type == UNIX_BLOCKDEV) {
234                 *pobject_type = DT_BLK;
235                 tmp_inode->i_mode |= S_IFBLK;
236                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
237                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
238         } else if (type == UNIX_FIFO) {
239                 *pobject_type = DT_FIFO;
240                 tmp_inode->i_mode |= S_IFIFO;
241         } else if (type == UNIX_SOCKET) {
242                 *pobject_type = DT_SOCK;
243                 tmp_inode->i_mode |= S_IFSOCK;
244         }
245
246         tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
247         tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
248         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
249
250         if (is_size_safe_to_change(cifsInfo)) {
251                 /* can not safely change the file size here if the 
252                 client is writing to it due to potential races */
253                 i_size_write(tmp_inode,end_of_file);
254
255         /* 512 bytes (2**9) is the fake blocksize that must be used */
256         /* for this calculation, not the real blocksize */
257                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
258         }
259
260         if (S_ISREG(tmp_inode->i_mode)) {
261                 cFYI(1, ("File inode"));
262                 tmp_inode->i_op = &cifs_file_inode_ops;
263                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
264                         tmp_inode->i_fop = &cifs_file_direct_ops;
265                 else
266                         tmp_inode->i_fop = &cifs_file_ops;
267                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
268         } else if (S_ISDIR(tmp_inode->i_mode)) {
269                 cFYI(1, ("Directory inode"));
270                 tmp_inode->i_op = &cifs_dir_inode_ops;
271                 tmp_inode->i_fop = &cifs_dir_ops;
272         } else if (S_ISLNK(tmp_inode->i_mode)) {
273                 cFYI(1, ("Symbolic Link inode"));
274                 tmp_inode->i_op = &cifs_symlink_inode_ops;
275 /* tmp_inode->i_fop = *//* do not need to set to anything */
276         } else {
277                 cFYI(1, ("Special inode")); 
278                 init_special_inode(tmp_inode, tmp_inode->i_mode,
279                                    tmp_inode->i_rdev);
280         }
281 }
282
283 static int initiate_cifs_search(const int xid, struct file *file)
284 {
285         int rc = 0;
286         char * full_path;
287         struct cifsFileInfo * cifsFile;
288         struct cifs_sb_info *cifs_sb;
289         struct cifsTconInfo *pTcon;
290
291         if(file->private_data == NULL) {
292                 file->private_data = 
293                         kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
294         }
295
296         if(file->private_data == NULL) {
297                 return -ENOMEM;
298         } else {
299                 memset(file->private_data,0,sizeof(struct cifsFileInfo));
300         }
301         cifsFile = file->private_data;
302         cifsFile->invalidHandle = TRUE;
303         cifsFile->srch_inf.endOfSearch = FALSE;
304
305         if(file->f_dentry == NULL)
306                 return -ENOENT;
307
308         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
309         if(cifs_sb == NULL)
310                 return -EINVAL;
311
312         pTcon = cifs_sb->tcon;
313         if(pTcon == NULL)
314                 return -EINVAL;
315
316         down(&file->f_dentry->d_sb->s_vfs_rename_sem);
317         full_path = build_wildcard_path_from_dentry(file->f_dentry);
318         up(&file->f_dentry->d_sb->s_vfs_rename_sem);
319
320         if(full_path == NULL) {
321                 return -ENOMEM;
322         }
323
324         cFYI(1, ("Full path: %s start at: %lld ", full_path, file->f_pos));
325
326         /* test for Unix extensions */
327         if (pTcon->ses->capabilities & CAP_UNIX) {
328                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX; 
329         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
330                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
331         } else /* not srvinos - BB fixme add check for backlevel? */ {
332                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
333         }
334
335         rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls, 
336                 &cifsFile->netfid, &cifsFile->srch_inf); 
337         if(rc == 0)
338                 cifsFile->invalidHandle = FALSE;
339         kfree(full_path);
340         return rc;
341 }
342
343 /* return length of unicode string in bytes */
344 static int cifs_unicode_bytelen(char *str)
345 {
346         int len;
347         __le16 * ustr = (__le16 *)str;
348
349         for(len=0;len <= PATH_MAX;len++) {
350                 if(ustr[len] == 0)
351                         return len << 1;
352         }
353         cFYI(1,("Unicode string longer than PATH_MAX found"));
354         return len << 1;
355 }
356
357 static char *nxt_dir_entry(char *old_entry, char *end_of_smb)
358 {
359         char * new_entry;
360         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
361
362         new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
363         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
364         /* validate that new_entry is not past end of SMB */
365         if(new_entry >= end_of_smb) {
366                 cFYI(1,("search entry %p began after end of SMB %p old entry %p",
367                         new_entry,end_of_smb,old_entry)); 
368                 return NULL;
369         } else
370                 return new_entry;
371
372 }
373
374 #define UNICODE_DOT cpu_to_le16(0x2e)
375
376 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
377 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
378 {
379         int rc = 0;
380         char * filename = NULL;
381         int len = 0; 
382
383         if(cfile->srch_inf.info_level == 0x202) {
384                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
385                 filename = &pFindData->FileName[0];
386                 if(cfile->srch_inf.unicode) {
387                         len = cifs_unicode_bytelen(filename);
388                 } else {
389                         /* BB should we make this strnlen of PATH_MAX? */
390                         len = strnlen(filename, 5);
391                 }
392         } else if(cfile->srch_inf.info_level == 0x101) {
393                 FILE_DIRECTORY_INFO * pFindData = 
394                         (FILE_DIRECTORY_INFO *)current_entry;
395                 filename = &pFindData->FileName[0];
396                 len = le32_to_cpu(pFindData->FileNameLength);
397         } else if(cfile->srch_inf.info_level == 0x102) {
398                 FILE_FULL_DIRECTORY_INFO * pFindData = 
399                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
400                 filename = &pFindData->FileName[0];
401                 len = le32_to_cpu(pFindData->FileNameLength);
402         } else if(cfile->srch_inf.info_level == 0x105) {
403                 SEARCH_ID_FULL_DIR_INFO * pFindData = 
404                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
405                 filename = &pFindData->FileName[0];
406                 len = le32_to_cpu(pFindData->FileNameLength);
407         } else if(cfile->srch_inf.info_level == 0x104) {
408                 FILE_BOTH_DIRECTORY_INFO * pFindData = 
409                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
410                 filename = &pFindData->FileName[0];
411                 len = le32_to_cpu(pFindData->FileNameLength);
412         } else {
413                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
414         }
415
416         if(filename) {
417                 if(cfile->srch_inf.unicode) {
418                         __le16 *ufilename = (__le16 *)filename;
419                         if(len == 2) {
420                                 /* check for . */
421                                 if(ufilename[0] == UNICODE_DOT)
422                                         rc = 1;
423                         } else if(len == 4) {
424                                 /* check for .. */
425                                 if((ufilename[0] == UNICODE_DOT)
426                                    &&(ufilename[1] == UNICODE_DOT))
427                                         rc = 2;
428                         }
429                 } else /* ASCII */ {
430                         if(len == 1) {
431                                 if(filename[0] == '.') 
432                                         rc = 1;
433                         } else if(len == 2) {
434                                 if((filename[0] == '.') && (filename[1] == '.')) 
435                                         rc = 2;
436                         }
437                 }
438         }
439
440         return rc;
441 }
442
443 /* find the corresponding entry in the search */
444 /* Note that the SMB server returns search entries for . and .. which
445    complicates logic here if we choose to parse for them and we do not
446    assume that they are located in the findfirst return buffer.*/
447 /* We start counting in the buffer with entry 2 and increment for every
448    entry (do not increment for . or .. entry) */
449 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
450         struct file *file, char **ppCurrentEntry, int *num_to_ret) 
451 {
452         int rc = 0;
453         int pos_in_buf = 0;
454         loff_t first_entry_in_buffer;
455         loff_t index_to_find = file->f_pos;
456         struct cifsFileInfo * cifsFile = file->private_data;
457         /* check if index in the buffer */
458         
459         if((cifsFile == NULL) || (ppCurrentEntry == NULL) || (num_to_ret == NULL))
460                 return -ENOENT;
461         
462         *ppCurrentEntry = NULL;
463         first_entry_in_buffer = 
464                 cifsFile->srch_inf.index_of_last_entry - 
465                         cifsFile->srch_inf.entries_in_buffer;
466 /*      dump_cifs_file_struct(file, "In fce ");*/
467         if(index_to_find < first_entry_in_buffer) {
468                 /* close and restart search */
469                 cFYI(1,("search backing up - close and restart search"));
470                 cifsFile->invalidHandle = TRUE;
471                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
472                 kfree(cifsFile->search_resume_name);
473                 cifsFile->search_resume_name = NULL;
474                 if(cifsFile->srch_inf.ntwrk_buf_start) {
475                         cFYI(1,("freeing SMB ff cache buf on search rewind"));
476                         cifs_buf_release(cifsFile->srch_inf.ntwrk_buf_start);
477                 }
478                 rc = initiate_cifs_search(xid,file);
479                 if(rc) {
480                         cFYI(1,("error %d reinitiating a search on rewind",rc));
481                         return rc;
482                 }
483         }
484
485         while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) && 
486               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
487                 cFYI(1,("calling findnext2"));
488                 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid, &cifsFile->srch_inf);
489                 if(rc)
490                         return -ENOENT;
491         }
492         if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
493                 /* we found the buffer that contains the entry */
494                 /* scan and find it */
495                 int i;
496                 char * current_entry;
497                 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + 
498                         smbCalcSize((struct smb_hdr *)
499                                 cifsFile->srch_inf.ntwrk_buf_start);
500 /*      dump_cifs_file_struct(file,"found entry in fce "); */
501                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
502                                         - cifsFile->srch_inf.entries_in_buffer;
503                 pos_in_buf = index_to_find - first_entry_in_buffer;
504                 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf)); 
505                 current_entry = cifsFile->srch_inf.srch_entries_start;
506                 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
507                         /* go entry to next entry figuring out which we need to start with */
508                         /* if( . or ..)
509                                 skip */
510                         rc = cifs_entry_is_dot(current_entry,cifsFile);
511                         if(rc == 1) /* is . or .. so skip */ {
512                                 cFYI(1,("Entry is .")); /* BB removeme BB */
513                                 /* continue; */
514                         } else if (rc == 2 ) {
515                                 cFYI(1,("Entry is ..")); /* BB removeme BB */
516                                 /* continue; */
517                         }
518                         current_entry = nxt_dir_entry(current_entry,end_of_smb);
519                 }
520                 if((current_entry == NULL) && (i < pos_in_buf)) {
521                         /* BB fixme - check if we should flag this error */
522                         cERROR(1,("reached end of buf searching for pos in buf"
523                           " %d index to find %lld rc %d",
524                           pos_in_buf,index_to_find,rc));
525                 }
526                 rc = 0;
527                 *ppCurrentEntry = current_entry;
528         } else {
529                 cFYI(1,("index not in buffer - could not findnext into it"));
530                 return 0;
531         }
532
533         if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
534                 cFYI(1,("can not return entries when pos_in_buf beyond last entry"));
535                 *num_to_ret = 0;
536         } else
537                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
538 /*      dump_cifs_file_struct(file, "end fce ");*/
539
540         return rc;
541 }
542
543 /* inode num, inode type and filename returned */
544 static int cifs_get_name_from_search_buf(struct qstr *pqst,
545         char *current_entry, __u16 level, unsigned int unicode,
546         struct cifs_sb_info * cifs_sb, ino_t *pinum)
547 {
548         int rc = 0;
549         unsigned int len = 0;
550         char * filename;
551         struct nls_table * nlt = cifs_sb->local_nls;
552
553         *pinum = 0;
554
555         if(level == SMB_FIND_FILE_UNIX) {
556                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
557
558                 filename = &pFindData->FileName[0];
559                 if(unicode) {
560                         len = cifs_unicode_bytelen(filename);
561                 } else {
562                         /* BB should we make this strnlen of PATH_MAX? */
563                         len = strnlen(filename, PATH_MAX);
564                 }
565
566                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
567                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
568                         *pinum = pFindData->UniqueId;
569         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
570                 FILE_DIRECTORY_INFO * pFindData = 
571                         (FILE_DIRECTORY_INFO *)current_entry;
572                 filename = &pFindData->FileName[0];
573                 len = le32_to_cpu(pFindData->FileNameLength);
574         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
575                 FILE_FULL_DIRECTORY_INFO * pFindData = 
576                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
577                 filename = &pFindData->FileName[0];
578                 len = le32_to_cpu(pFindData->FileNameLength);
579         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
580                 SEARCH_ID_FULL_DIR_INFO * pFindData = 
581                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
582                 filename = &pFindData->FileName[0];
583                 len = le32_to_cpu(pFindData->FileNameLength);
584                 *pinum = pFindData->UniqueId;
585         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
586                 FILE_BOTH_DIRECTORY_INFO * pFindData = 
587                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
588                 filename = &pFindData->FileName[0];
589                 len = le32_to_cpu(pFindData->FileNameLength);
590         } else {
591                 cFYI(1,("Unknown findfirst level %d",level));
592                 return -EINVAL;
593         }
594         if(unicode) {
595                 /* BB fixme - test with long names */
596                 /* Note converted filename can be longer than in unicode */
597                 pqst->len = cifs_strfromUCS_le((char *)pqst->name,(wchar_t *)filename,len/2,nlt);
598         } else {
599                 pqst->name = filename;
600                 pqst->len = len;
601         }
602         pqst->hash = full_name_hash(pqst->name,pqst->len);
603 /*      cFYI(1,("filldir on %s",pqst->name));  */
604         return rc;
605 }
606
607 static int cifs_filldir(char *pfindEntry, struct file *file,
608         filldir_t filldir, void *direntry, char *scratch_buf)
609 {
610         int rc = 0;
611         struct qstr qstring;
612         struct cifsFileInfo * pCifsF;
613         unsigned obj_type;
614         ino_t  inum;
615         struct cifs_sb_info * cifs_sb;
616         struct inode *tmp_inode;
617         struct dentry *tmp_dentry;
618
619         /* get filename and len into qstring */
620         /* get dentry */
621         /* decide whether to create and populate ionde */
622         if((direntry == NULL) || (file == NULL))
623                 return -EINVAL;
624
625         pCifsF = file->private_data;
626         
627         if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
628                 return -ENOENT;
629
630         if(file->f_dentry == NULL)
631                 return -ENOENT;
632
633         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
634
635         qstring.name = scratch_buf;
636         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
637                         pCifsF->srch_inf.info_level,
638                         pCifsF->srch_inf.unicode,cifs_sb,
639                         &inum /* returned */);
640
641         if(rc)
642                 return rc;
643
644         rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
645         if((tmp_inode == NULL) || (tmp_dentry == NULL))
646                 return -ENOMEM;
647
648         if(rc) {
649                 /* inode created, we need to hash it with right inode number */
650                 if(inum != 0) {
651                         /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
652                         tmp_inode->i_ino = inum;
653                 }
654                 insert_inode_hash(tmp_inode);
655         }
656
657         if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
658                 unix_fill_in_inode(tmp_inode,(FILE_UNIX_INFO *)pfindEntry,&obj_type);
659         } else {
660                 fill_in_inode(tmp_inode,(FILE_DIRECTORY_INFO *)pfindEntry,&obj_type);
661         }
662         
663         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,tmp_inode->i_ino,obj_type);
664         if(rc) {
665                 cFYI(1,("filldir rc = %d",rc));
666         }
667
668         dput(tmp_dentry);
669         return rc;
670 }
671
672 static int cifs_save_resume_key(const char *current_entry,
673         struct cifsFileInfo *cifsFile)
674 {
675         int rc = 0;
676         unsigned int len = 0;
677         __u16 level;
678         char * filename;
679
680         if((cifsFile == NULL) || (current_entry == NULL))
681                 return -EINVAL;
682
683         level = cifsFile->srch_inf.info_level;
684
685         if(level == SMB_FIND_FILE_UNIX) {
686                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
687
688                 filename = &pFindData->FileName[0];
689                 if(cifsFile->srch_inf.unicode) {
690                         len = cifs_unicode_bytelen(filename);
691                 } else {
692                         /* BB should we make this strnlen of PATH_MAX? */
693                         len = strnlen(filename, PATH_MAX);
694                 }
695                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
696         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
697                 FILE_DIRECTORY_INFO * pFindData = 
698                         (FILE_DIRECTORY_INFO *)current_entry;
699                 filename = &pFindData->FileName[0];
700                 len = le32_to_cpu(pFindData->FileNameLength);
701                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
702         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
703                 FILE_FULL_DIRECTORY_INFO * pFindData = 
704                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
705                 filename = &pFindData->FileName[0];
706                 len = le32_to_cpu(pFindData->FileNameLength);
707                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
708         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
709                 SEARCH_ID_FULL_DIR_INFO * pFindData = 
710                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
711                 filename = &pFindData->FileName[0];
712                 len = le32_to_cpu(pFindData->FileNameLength);
713                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
714         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
715                 FILE_BOTH_DIRECTORY_INFO * pFindData = 
716                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
717                 filename = &pFindData->FileName[0];
718                 len = le32_to_cpu(pFindData->FileNameLength);
719                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
720         } else {
721                 cFYI(1,("Unknown findfirst level %d",level));
722                 return -EINVAL;
723         }
724         cifsFile->srch_inf.resume_name_len = len;
725         cifsFile->srch_inf.presume_name = filename;
726         return rc;
727 }
728
729 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
730 {
731         int rc = 0;
732         int xid,i;
733         struct cifs_sb_info *cifs_sb;
734         struct cifsTconInfo *pTcon;
735         struct cifsFileInfo *cifsFile = NULL;
736         char * current_entry;
737         int num_to_fill = 0;
738         char * tmp_buf = NULL;
739         char * end_of_smb;
740
741         xid = GetXid();
742
743         if(file->f_dentry == NULL) {
744                 FreeXid(xid);
745                 return -EIO;
746         }
747 /*      dump_cifs_file_struct(file, "Begin rdir "); */
748
749         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
750         pTcon = cifs_sb->tcon;
751         if(pTcon == NULL)
752                 return -EINVAL;
753
754 /*      cFYI(1,("readdir2 pos: %lld",file->f_pos)); */
755
756         switch ((int) file->f_pos) {
757         case 0:
758                 /*if (filldir(direntry, ".", 1, file->f_pos,
759                      file->f_dentry->d_inode->i_ino, DT_DIR) < 0) {
760                         cERROR(1, ("Filldir for current dir failed "));
761                         rc = -ENOMEM;
762                         break;
763                 }
764                 file->f_pos++; */
765         case 1:
766                 /* if (filldir(direntry, "..", 2, file->f_pos,
767                      file->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
768                         cERROR(1, ("Filldir for parent dir failed "));
769                         rc = -ENOMEM;
770                         break;
771                 }
772                 file->f_pos++; */
773         case 2:
774                 /* 1) If search is active, 
775                         is in current search buffer? 
776                         if it before then restart search
777                         if after then keep searching till find it */
778
779                 if(file->private_data == NULL) {
780                         rc = initiate_cifs_search(xid,file);
781                         cFYI(1,("initiate cifs search rc %d",rc));
782                         if(rc) {
783                                 FreeXid(xid);
784                                 return rc;
785                         }
786                 }
787         default:
788                 if(file->private_data == NULL) {
789                         rc = -EINVAL;
790                         FreeXid(xid);
791                         return rc;
792                 }
793                 cifsFile = file->private_data;
794                 if (cifsFile->srch_inf.endOfSearch) {
795                         if(cifsFile->srch_inf.emptyDir) {
796                                 cFYI(1, ("End of search, empty dir"));
797                                 rc = 0;
798                                 break;
799                         }
800                 } /* else {
801                         cifsFile->invalidHandle = TRUE;
802                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
803                 } 
804                 kfree(cifsFile->search_resume_name);
805                 cifsFile->search_resume_name = NULL; */
806
807                 /* BB account for . and .. in f_pos as special case */
808                 /* dump_cifs_file_struct(file, "rdir after default ");*/
809
810                 rc = find_cifs_entry(xid,pTcon, file,
811                                 &current_entry,&num_to_fill);
812                 if(rc) {
813                         cFYI(1,("fce error %d",rc)); 
814                         goto rddir2_exit;
815                 } else if (current_entry != NULL) {
816                         cFYI(1,("entry %lld found",file->f_pos));
817                 } else {
818                         cFYI(1,("could not find entry"));
819                         goto rddir2_exit;
820                 }
821                 cFYI(1,("loop through %d times filling dir for net buf %p",
822                         num_to_fill,cifsFile->srch_inf.ntwrk_buf_start)); 
823                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
824                         smbCalcSize((struct smb_hdr *)
825                                     cifsFile->srch_inf.ntwrk_buf_start);
826                 tmp_buf = kmalloc(NAME_MAX+1,GFP_KERNEL);
827                 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
828                         if(current_entry == NULL) {
829                                 /* evaluate whether this case is an error */
830                                 cERROR(1,("past end of SMB num to fill %d i %d",
831                                           num_to_fill, i));
832                                 break;
833                         }
834
835                         /* BB FIXME - need to enable the below code BB */
836
837                 /* if((!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) ||
838                            (cifsFile->srch_inf.info_level != 
839                                    something that supports server inodes)) {
840                                 create dentry
841                                 create inode
842                                 fill in inode new_inode (getting local i_ino)
843                         }
844                         also create local inode for performance reasons (so we 
845                         have a cache of inode metadata) unless this new mount 
846                         parm says otherwise */
847
848                         rc = cifs_filldir(current_entry, file, 
849                                         filldir, direntry,tmp_buf);
850                         file->f_pos++;
851                         if(file->f_pos == cifsFile->srch_inf.index_of_last_entry) {
852                                 cFYI(1,("last entry in buf at pos %lld %s",
853                                         file->f_pos,tmp_buf)); /* BB removeme BB */
854                                 cifs_save_resume_key(current_entry,cifsFile);
855                                 break;
856                         } else 
857                                 current_entry = nxt_dir_entry(current_entry,end_of_smb);
858                 }
859                 kfree(tmp_buf);
860                 break;
861         } /* end switch */
862
863 rddir2_exit:
864         /* dump_cifs_file_struct(file, "end rdir ");  */
865         FreeXid(xid);
866         return rc;
867 }